diff --git a/lib/claper/presentations.ex b/lib/claper/presentations.ex
index 6427abe..3b1db9d 100644
--- a/lib/claper/presentations.ex
+++ b/lib/claper/presentations.ex
@@ -156,6 +156,19 @@ defmodule Claper.Presentations do
     end
   end
 
+  @doc """
+  Returns true when a presentation has slides but no generated thumbnails.
+  """
+  def missing_slide_thumbnails?(nil), do: false
+
+  def missing_slide_thumbnails?(%PresentationFile{hash: nil}), do: false
+  def missing_slide_thumbnails?(%PresentationFile{length: nil}), do: false
+  def missing_slide_thumbnails?(%PresentationFile{length: 0}), do: false
+
+  def missing_slide_thumbnails?(%PresentationFile{hash: hash}) do
+    not slide_thumbnails_available?(hash)
+  end
+
   @doc """
   Creates a presentation_files.
 
@@ -246,4 +259,44 @@ defmodule Claper.Presentations do
 
     {:ok, state}
   end
+
+  defp slide_thumbnails_available?(hash) when is_binary(hash) do
+    config = Application.get_env(:claper, :presentations)
+
+    case Keyword.fetch!(config, :storage) do
+      "local" ->
+        thumbnails_glob(hash)
+        |> Path.wildcard()
+        |> Enum.any?()
+
+      "s3" ->
+        ExAws.S3.list_objects(get_s3_bucket(), prefix: "presentations/#{hash}/thumbs/")
+        |> ExAws.stream!()
+        |> Enum.take(1)
+        |> Enum.any?()
+
+      storage ->
+        raise "Unrecognised presentations storage value #{storage}"
+    end
+  rescue
+    _ -> false
+  end
+
+  defp thumbnails_glob(hash) do
+    Path.join([
+      get_presentation_storage_dir(),
+      "uploads",
+      hash,
+      "thumbs",
+      "*.jpg"
+    ])
+  end
+
+  defp get_presentation_storage_dir do
+    Application.get_env(:claper, :storage_dir)
+  end
+
+  defp get_s3_bucket do
+    Application.get_env(:claper, :presentations) |> Keyword.get(:s3_bucket)
+  end
 end
diff --git a/lib/claper/tasks/converter.ex b/lib/claper/tasks/converter.ex
index 8d29eb9..475bed1 100644
--- a/lib/claper/tasks/converter.ex
+++ b/lib/claper/tasks/converter.ex
@@ -5,6 +5,7 @@ defmodule Claper.Tasks.Converter do
   """
 
   alias Claper.Events
+  alias Claper.Presentations.PresentationFile
   alias Porcelain.Result
 
   @doc """
@@ -64,6 +65,27 @@ defmodule Claper.Tasks.Converter do
     end
   end
 
+  @doc """
+  Regenerates thumbnails for an already converted presentation.
+  """
+  def regenerate_thumbnails(%PresentationFile{hash: nil}), do: {:error, :missing_hash}
+  def regenerate_thumbnails(%PresentationFile{length: nil}), do: {:error, :missing_length}
+  def regenerate_thumbnails(%PresentationFile{length: 0}), do: {:error, :missing_length}
+
+  def regenerate_thumbnails(%PresentationFile{hash: hash, length: length}) do
+    case get_presentation_storage() do
+      "local" ->
+        path = Path.join([get_presentation_storage_dir(), "uploads", hash])
+        generate_thumbnails(path)
+
+      "s3" ->
+        regenerate_s3_thumbnails(hash, length)
+
+      storage ->
+        raise "Unrecognised presentations storage value #{storage}"
+    end
+  end
+
   defp file_to_pdf(:ppt, path, file) do
     Porcelain.exec(
       get_libreoffice_binary(),
@@ -112,13 +134,16 @@ defmodule Claper.Tasks.Converter do
         ]
       )
 
-    # Generate thumbnails after full-size images
     case result do
-      %Porcelain.Result{status: 0} -> generate_thumbnails(path)
-      _ -> result
-    end
+      %Porcelain.Result{status: 0} ->
+        case generate_thumbnails(path) do
+          :ok -> result
+          _ -> %Porcelain.Result{status: 1}
+        end
 
-    result
+      _ ->
+        result
+    end
   end
 
   defp pdf_to_jpg(_result, path, presentation, user_id) do
@@ -127,29 +152,42 @@ defmodule Claper.Tasks.Converter do
 
   defp generate_thumbnails(path) do
     thumbs_dir = Path.join(path, "thumbs")
+    File.rm_rf!(thumbs_dir)
     File.mkdir_p!(thumbs_dir)
 
     files = Path.wildcard("#{path}/*.jpg")
 
-    for file <- files do
-      thumb_path = Path.join(thumbs_dir, Path.basename(file))
+    if Enum.empty?(files) do
+      {:error, :missing_slides}
+    else
+      result =
+        Enum.reduce_while(files, :ok, fn file, _acc ->
+          thumb_path = Path.join(thumbs_dir, Path.basename(file))
 
-      # Generate thumbnail with 200px width, maintaining aspect ratio
-      # Using "magick" for ImageMagick v7+ compatibility
-      Porcelain.exec(
-        "magick",
-        [
-          file,
-          "-resize",
-          "200x",
-          "-quality",
-          "80",
-          thumb_path
-        ]
-      )
+          # Generate thumbnail with 200px width, maintaining aspect ratio
+          # Using "magick" for ImageMagick v7+ compatibility
+          case Porcelain.exec(
+                 "magick",
+                 [
+                   file,
+                   "-resize",
+                   "200x",
+                   "-quality",
+                   "80",
+                   thumb_path
+                 ]
+               ) do
+            %Porcelain.Result{status: 0} -> {:cont, :ok}
+            error -> {:halt, {:error, error}}
+          end
+        end)
+
+      if result == :ok do
+        IO.puts("Generated #{length(files)} thumbnails in #{thumbs_dir}")
+      end
+
+      result
     end
-
-    IO.puts("Generated #{length(files)} thumbnails in #{thumbs_dir}")
   end
 
   defp jpg_upload(%Result{status: 0}, hash, path, presentation, user_id, is_copy) do
@@ -259,4 +297,55 @@ defmodule Claper.Tasks.Converter do
       _ -> "libreoffice"
     end
   end
+
+  defp regenerate_s3_thumbnails(hash, length) do
+    path =
+      Path.join(System.tmp_dir!(), "claper-thumbs-#{hash}-#{System.unique_integer([:positive])}")
+
+    File.mkdir_p!(path)
+
+    with :ok <- download_s3_slides(path, hash, length),
+         :ok <- generate_thumbnails(path),
+         :ok <- upload_s3_thumbnails(path, hash) do
+      File.rm_rf!(path)
+      :ok
+    else
+      error ->
+        File.rm_rf!(path)
+        error
+    end
+  end
+
+  defp download_s3_slides(path, hash, length) do
+    Enum.reduce_while(1..length, :ok, fn index, _acc ->
+      key = "presentations/#{hash}/#{index}.jpg"
+
+      case ExAws.S3.get_object(get_s3_bucket(), key) |> ExAws.request() do
+        {:ok, %{body: body}} ->
+          file_path = Path.join(path, "#{index}.jpg")
+          File.write!(file_path, body, [:binary])
+          {:cont, :ok}
+
+        error ->
+          {:halt, {:error, error}}
+      end
+    end)
+  end
+
+  defp upload_s3_thumbnails(path, hash) do
+    path
+    |> Path.join("thumbs/*.jpg")
+    |> Path.wildcard()
+    |> Enum.reduce_while(:ok, fn file, _acc ->
+      key = "presentations/#{hash}/thumbs/#{Path.basename(file)}"
+
+      case file
+           |> ExAws.S3.Upload.stream_file()
+           |> ExAws.S3.upload(get_s3_bucket(), key, acl: "public-read")
+           |> ExAws.request() do
+        {:ok, _response} -> {:cont, :ok}
+        error -> {:halt, {:error, error}}
+      end
+    end)
+  end
 end
diff --git a/lib/claper/workers/presentation_thumbnails.ex b/lib/claper/workers/presentation_thumbnails.ex
new file mode 100644
index 0000000..60532dd
--- /dev/null
+++ b/lib/claper/workers/presentation_thumbnails.ex
@@ -0,0 +1,38 @@
+defmodule Claper.Workers.PresentationThumbnails do
+  use Oban.Worker, queue: :default
+
+  alias Claper.{Events, Presentations}
+  alias Claper.Tasks.Converter
+
+  @impl Oban.Worker
+  def perform(%Oban.Job{
+        args: %{"presentation_file_id" => presentation_file_id, "user_id" => user_id}
+      }) do
+    presentation_file = Presentations.get_presentation_file!(presentation_file_id)
+
+    case Converter.regenerate_thumbnails(presentation_file) do
+      :ok ->
+        Events.broadcast_user_events(
+          user_id,
+          {:presentation_file_thumbnails_regenerated, presentation_file_id}
+        )
+
+        :ok
+
+      {:error, _reason} = error ->
+        Events.broadcast_user_events(
+          user_id,
+          {:presentation_file_thumbnail_regeneration_failed, presentation_file_id}
+        )
+
+        error
+    end
+  end
+
+  def create(presentation_file_id, user_id) do
+    new(%{
+      "presentation_file_id" => presentation_file_id,
+      "user_id" => user_id
+    })
+  end
+end
diff --git a/lib/claper_web/live/event_live/manage.ex b/lib/claper_web/live/event_live/manage.ex
index 7ec7053..b43a565 100644
--- a/lib/claper_web/live/event_live/manage.ex
+++ b/lib/claper_web/live/event_live/manage.ex
@@ -1,21 +1,23 @@
 defmodule ClaperWeb.EventLive.Manage do
   use ClaperWeb, :live_view
 
-  alias Claper.{Embeds, Forms, Polls, Quizzes}
+  alias Claper.{Embeds, Events, Forms, Polls, Presentations, Quizzes}
+  alias Claper.Workers.PresentationThumbnails
   alias ClaperWeb.Presence
 
+  @event_preload [
+    :user,
+    :lti_resource,
+    presentation_file: [:polls, :presentation_state]
+  ]
+
   @impl true
   def mount(%{"code" => code}, session, socket) do
     with %{"locale" => locale} <- session do
       Gettext.put_locale(ClaperWeb.Gettext, locale)
     end
 
-    event =
-      Claper.Events.get_event_with_code(code, [
-        :user,
-        :lti_resource,
-        presentation_file: [:polls, :presentation_state]
-      ])
+    event = Events.get_event_with_code(code, @event_preload)
 
     if is_nil(event) || not leader?(socket, event) do
       {:ok,
@@ -25,7 +27,8 @@ defmodule ClaperWeb.EventLive.Manage do
     else
       if connected?(socket) do
         Claper.Events.Event.subscribe(event.uuid)
-        Claper.Presentations.subscribe(event.presentation_file.id)
+        Presentations.subscribe(event.presentation_file.id)
+        Events.subscribe_user_events(socket.assigns.current_user.id)
       end
 
       posts = list_all_posts(socket, event.uuid)
@@ -59,6 +62,12 @@ defmodule ClaperWeb.EventLive.Manage do
         |> assign(:create, nil)
         |> assign(:list_tab, :posts)
         |> assign(:create_action, :new)
+        |> assign(
+          :missing_slide_thumbnails,
+          Presentations.missing_slide_thumbnails?(event.presentation_file)
+        )
+        |> assign(:thumbnail_cache_bust, thumbnail_cache_bust())
+        |> assign(:thumbnail_regeneration_in_progress, false)
         |> push_event("page-manage", %{
           current_page: event.presentation_file.presentation_state.position,
           timeout: 500
@@ -296,6 +305,37 @@ defmodule ClaperWeb.EventLive.Manage do
     end
   end
 
+  @impl true
+  def handle_info(
+        {:presentation_file_process_done, %{id: presentation_file_id}},
+        %{assigns: %{event: %{presentation_file: %{id: presentation_file_id}}}} = socket
+      ) do
+    {:noreply, refresh_event(socket)}
+  end
+
+  @impl true
+  def handle_info(
+        {:presentation_file_thumbnails_regenerated, presentation_file_id},
+        %{assigns: %{event: %{presentation_file: %{id: presentation_file_id}}}} = socket
+      ) do
+    {:noreply,
+     socket
+     |> refresh_event()
+     |> assign(:thumbnail_regeneration_in_progress, false)
+     |> put_flash(:info, gettext("Thumbnails regenerated successfully"))}
+  end
+
+  @impl true
+  def handle_info(
+        {:presentation_file_thumbnail_regeneration_failed, presentation_file_id},
+        %{assigns: %{event: %{presentation_file: %{id: presentation_file_id}}}} = socket
+      ) do
+    {:noreply,
+     socket
+     |> assign(:thumbnail_regeneration_in_progress, false)
+     |> put_flash(:error, gettext("Could not regenerate thumbnails"))}
+  end
+
   @impl true
   def handle_info(_, socket) do
     {:noreply, socket}
@@ -329,6 +369,41 @@ defmodule ClaperWeb.EventLive.Manage do
      |> interactions_at_position(page)}
   end
 
+  @impl true
+  def handle_event(
+        "regenerate-thumbnails",
+        _params,
+        %{assigns: %{missing_slide_thumbnails: false}} = socket
+      ) do
+    {:noreply, socket}
+  end
+
+  @impl true
+  def handle_event(
+        "regenerate-thumbnails",
+        _params,
+        %{assigns: %{thumbnail_regeneration_in_progress: true}} = socket
+      ) do
+    {:noreply, socket}
+  end
+
+  @impl true
+  def handle_event("regenerate-thumbnails", _params, socket) do
+    presentation_file_id = socket.assigns.event.presentation_file.id
+    user_id = socket.assigns.current_user.id
+
+    case PresentationThumbnails.create(presentation_file_id, user_id) |> Oban.insert() do
+      {:ok, _job} ->
+        {:noreply,
+         socket
+         |> assign(:thumbnail_regeneration_in_progress, true)
+         |> put_flash(:info, gettext("Thumbnail regeneration started"))}
+
+      {:error, _changeset} ->
+        {:noreply, socket |> put_flash(:error, gettext("Could not start thumbnail regeneration"))}
+    end
+  end
+
   def handle_event("poll-set-active", %{"id" => id}, socket) do
     case Polls.get_poll_for_event(id, event_id(socket)) do
       nil ->
@@ -1062,4 +1137,21 @@ defmodule ClaperWeb.EventLive.Manage do
   defp list_form_submits(_socket, presentation_file_id) do
     Claper.Forms.list_form_submits(presentation_file_id, [:form])
   end
+
+  defp refresh_event(%{assigns: %{event: event}} = socket) do
+    refreshed_event = Events.get_event_with_code(event.code, @event_preload)
+
+    socket
+    |> assign(:event, refreshed_event)
+    |> assign(:state, refreshed_event.presentation_file.presentation_state)
+    |> assign(
+      :missing_slide_thumbnails,
+      Presentations.missing_slide_thumbnails?(refreshed_event.presentation_file)
+    )
+    |> assign(:thumbnail_cache_bust, thumbnail_cache_bust())
+  end
+
+  defp thumbnail_cache_bust do
+    System.system_time(:second)
+  end
 end
diff --git a/lib/claper_web/live/event_live/manage.html.heex b/lib/claper_web/live/event_live/manage.html.heex
index efc62bc..1187fa2 100644
--- a/lib/claper_web/live/event_live/manage.html.heex
+++ b/lib/claper_web/live/event_live/manage.html.heex
@@ -428,7 +428,7 @@
   <div id="wrapper" class="flex-1 flex overflow-hidden">
     <!-- Left Sidebar - Slide Thumbnails -->
     <aside
-      :if={@event.presentation_file.length > 0}
+      :if={@event.presentation_file.length > 0 and not @missing_slide_thumbnails}
       class="hidden lg:flex w-56 flex-shrink-0 bg-white overflow-hidden"
     >
       <.live_component
@@ -436,6 +436,7 @@
         module={ClaperWeb.EventLive.ManageSlideSidebarComponent}
         presentation_file={@event.presentation_file}
         current_position={@state.position}
+        thumbnail_cache_bust={@thumbnail_cache_bust}
       />
     </aside>
     
@@ -449,6 +450,8 @@
           presentation_file={@event.presentation_file}
           current_position={@state.position}
           total_slides={@event.presentation_file.length}
+          missing_slide_thumbnails={@missing_slide_thumbnails}
+          thumbnail_regeneration_in_progress={@thumbnail_regeneration_in_progress}
         />
       </div>
       
diff --git a/lib/claper_web/live/event_live/manage_slide_preview_component.ex b/lib/claper_web/live/event_live/manage_slide_preview_component.ex
index 7ae07b7..fb7afb3 100644
--- a/lib/claper_web/live/event_live/manage_slide_preview_component.ex
+++ b/lib/claper_web/live/event_live/manage_slide_preview_component.ex
@@ -55,6 +55,30 @@ defmodule ClaperWeb.EventLive.ManageSlidePreviewComponent do
           <span class="font-normal">{@current_position + 1}/ {@total_slides}</span>
         </div>
       </div>
+      <div
+        :if={@missing_slide_thumbnails}
+        class="mx-4 mb-2 rounded-xl border border-dashed border-amber-300 bg-amber-50 px-4 py-3 text-sm text-amber-900"
+      >
+        <div class="flex flex-col gap-3 md:flex-row md:items-center md:justify-between">
+          <div>
+            <p class="font-semibold">{gettext("No thumbnails are available")}</p>
+            <p class="mt-1 text-xs text-amber-800">
+              {gettext("Regenerate them to restore the presentation preview sidebar.")}
+            </p>
+          </div>
+          <button
+            phx-click="regenerate-thumbnails"
+            type="button"
+            data-confirm={gettext("No thumbnails are available. Regenerate them?")}
+            disabled={@thumbnail_regeneration_in_progress}
+            class="btn btn-sm btn-warning"
+          >
+            {if @thumbnail_regeneration_in_progress,
+              do: gettext("Regenerating..."),
+              else: gettext("Regenerate thumbnails")}
+          </button>
+        </div>
+      </div>
       <div class="flex-1 flex items-center justify-center gap-x-4 px-4 py-2 overflow-hidden">
         <div class="flex-shrink-0">
           <button
diff --git a/lib/claper_web/live/event_live/manage_slide_sidebar_component.ex b/lib/claper_web/live/event_live/manage_slide_sidebar_component.ex
index 8b94073..55a2245 100644
--- a/lib/claper_web/live/event_live/manage_slide_sidebar_component.ex
+++ b/lib/claper_web/live/event_live/manage_slide_sidebar_component.ex
@@ -4,6 +4,13 @@ defmodule ClaperWeb.EventLive.ManageSlideSidebarComponent do
   alias Claper.Presentations
 
   def render(assigns) do
+    thumbnail_urls =
+      assigns.presentation_file
+      |> Presentations.get_slide_thumbnail_urls()
+      |> Enum.map(&append_cache_bust(&1, assigns.thumbnail_cache_bust))
+
+    assigns = assign(assigns, :thumbnail_urls, thumbnail_urls)
+
     ~H"""
     <div class="flex flex-col h-full bg-gray-100 rounded-r-2xl px-4">
       <div class="px-4 py-3 flex items-center gap-x-2">
@@ -35,10 +42,7 @@ defmodule ClaperWeb.EventLive.ManageSlideSidebarComponent do
       </div>
       <div class="flex-1 overflow-y-auto p-3 space-y-2">
         <button
-          :for={
-            {src, index} <-
-              Presentations.get_slide_thumbnail_urls(@presentation_file) |> Enum.with_index(0)
-          }
+          :for={{src, index} <- @thumbnail_urls |> Enum.with_index(0)}
           id={"slide-thumb-#{index}"}
           phx-click="current-page"
           phx-value-page={index}
@@ -61,4 +65,7 @@ defmodule ClaperWeb.EventLive.ManageSlideSidebarComponent do
     </div>
     """
   end
+
+  defp append_cache_bust(url, nil), do: url
+  defp append_cache_bust(url, cache_bust), do: "#{url}?v=#{cache_bust}"
 end
diff --git a/priv/gettext/de/LC_MESSAGES/default.po b/priv/gettext/de/LC_MESSAGES/default.po
index c0d1228..5606b4a 100644
--- a/priv/gettext/de/LC_MESSAGES/default.po
+++ b/priv/gettext/de/LC_MESSAGES/default.po
@@ -16,7 +16,7 @@ msgstr "Einstellungen"
 #: lib/claper_web/live/admin_live/user_live.html.heex:41
 #: lib/claper_web/live/admin_live/user_live.html.heex:104
 #: lib/claper_web/live/admin_live/user_live/form_component.ex:18
-#: lib/claper_web/live/event_live/manage.ex:914
+#: lib/claper_web/live/event_live/manage.ex:989
 #: lib/claper_web/live/form_live/form_component.html.heex:32
 #: lib/claper_web/live/user_settings_live/show.html.heex:18
 #: lib/claper_web/templates/user_registration/new.html.heex:63
@@ -685,7 +685,7 @@ msgstr "Formular"
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:74
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:234
 #: lib/claper_web/live/admin_live/oidc_provider_live/form_component.ex:24
-#: lib/claper_web/live/event_live/manage.ex:913
+#: lib/claper_web/live/event_live/manage.ex:988
 #, elixir-autogen, elixir-format
 msgid "Name"
 msgstr "Name"
@@ -1061,7 +1061,7 @@ msgstr "Wann beginnt Ihre Veranstaltung?"
 msgid "Create your next presentation with"
 msgstr "Erstellen Sie Ihre nächste Präsentation mit"
 
-#: lib/claper_web/live/event_live/manage.ex:23
+#: lib/claper_web/live/event_live/manage.ex:25
 #: lib/claper_web/live/event_live/presenter.ex:26
 #: lib/claper_web/live/event_live/show.ex:38
 #, elixir-autogen, elixir-format
@@ -1326,12 +1326,12 @@ msgstr "Laden Sie die Seite, auf die Sie zugreifen möchten, neu (senden Sie kei
 msgid "Try logging in again"
 msgstr "Versuchen Sie, sich erneut anzumelden"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "No"
 msgstr "Nein"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "Yes"
 msgstr "Ja"
@@ -2413,7 +2413,7 @@ msgstr "Teilnehmer"
 msgid "Audience Responses"
 msgstr "Publikumsantworten"
 
-#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:34
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:45
 #, elixir-autogen, elixir-format
 msgid "Content"
 msgstr "Inhalt"
@@ -2518,7 +2518,7 @@ msgstr "Keine Interaktionen auf dieser Folie"
 msgid "No settings available for this interaction"
 msgstr "Keine Einstellungen für diese Interaktion verfügbar"
 
-#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:107
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:131
 #, elixir-autogen, elixir-format
 msgid "No slide available"
 msgstr "Keine Folie verfügbar"
@@ -2652,10 +2652,10 @@ msgstr ""
 msgid "Resource Type"
 msgstr "Antworttyp"
 
-#: lib/claper_web/live/event_live/manage.ex:894
-#: lib/claper_web/live/event_live/manage.ex:937
-#: lib/claper_web/live/event_live/manage.ex:953
-#: lib/claper_web/live/event_live/manage.ex:995
+#: lib/claper_web/live/event_live/manage.ex:969
+#: lib/claper_web/live/event_live/manage.ex:1012
+#: lib/claper_web/live/event_live/manage.ex:1028
+#: lib/claper_web/live/event_live/manage.ex:1070
 #, elixir-autogen, elixir-format
 msgid "Resource not found"
 msgstr ""
@@ -2887,3 +2887,57 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Sign in to manage your presentations."
 msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:336
+#, elixir-autogen, elixir-format
+msgid "Could not regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:403
+#, elixir-autogen, elixir-format
+msgid "Could not start thumbnail regeneration"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:64
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:52
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:72
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:59
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available. Regenerate them?"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:66
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the presentation preview sidebar."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:54
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the slide sidebar preview."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:78
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:65
+#, elixir-autogen, elixir-format
+msgid "Regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:77
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:64
+#, elixir-autogen, elixir-format
+msgid "Regenerating..."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:400
+#, elixir-autogen, elixir-format
+msgid "Thumbnail regeneration started"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:325
+#, elixir-autogen, elixir-format
+msgid "Thumbnails regenerated successfully"
+msgstr ""
diff --git a/priv/gettext/default.pot b/priv/gettext/default.pot
index c618095..1e210fd 100644
--- a/priv/gettext/default.pot
+++ b/priv/gettext/default.pot
@@ -18,7 +18,7 @@ msgstr ""
 #: lib/claper_web/live/admin_live/user_live.html.heex:41
 #: lib/claper_web/live/admin_live/user_live.html.heex:104
 #: lib/claper_web/live/admin_live/user_live/form_component.ex:18
-#: lib/claper_web/live/event_live/manage.ex:914
+#: lib/claper_web/live/event_live/manage.ex:989
 #: lib/claper_web/live/form_live/form_component.html.heex:32
 #: lib/claper_web/live/user_settings_live/show.html.heex:18
 #: lib/claper_web/templates/user_registration/new.html.heex:63
@@ -687,7 +687,7 @@ msgstr ""
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:74
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:234
 #: lib/claper_web/live/admin_live/oidc_provider_live/form_component.ex:24
-#: lib/claper_web/live/event_live/manage.ex:913
+#: lib/claper_web/live/event_live/manage.ex:988
 #, elixir-autogen, elixir-format
 msgid "Name"
 msgstr ""
@@ -1063,7 +1063,7 @@ msgstr ""
 msgid "Create your next presentation with"
 msgstr ""
 
-#: lib/claper_web/live/event_live/manage.ex:23
+#: lib/claper_web/live/event_live/manage.ex:25
 #: lib/claper_web/live/event_live/presenter.ex:26
 #: lib/claper_web/live/event_live/show.ex:38
 #, elixir-autogen, elixir-format
@@ -1328,12 +1328,12 @@ msgstr ""
 msgid "Try logging in again"
 msgstr ""
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "No"
 msgstr ""
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "Yes"
 msgstr ""
@@ -2415,7 +2415,7 @@ msgstr ""
 msgid "Audience Responses"
 msgstr ""
 
-#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:34
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:45
 #, elixir-autogen, elixir-format
 msgid "Content"
 msgstr ""
@@ -2520,7 +2520,7 @@ msgstr ""
 msgid "No settings available for this interaction"
 msgstr ""
 
-#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:107
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:131
 #, elixir-autogen, elixir-format
 msgid "No slide available"
 msgstr ""
@@ -2654,10 +2654,10 @@ msgstr ""
 msgid "Resource Type"
 msgstr ""
 
-#: lib/claper_web/live/event_live/manage.ex:894
-#: lib/claper_web/live/event_live/manage.ex:937
-#: lib/claper_web/live/event_live/manage.ex:953
-#: lib/claper_web/live/event_live/manage.ex:995
+#: lib/claper_web/live/event_live/manage.ex:969
+#: lib/claper_web/live/event_live/manage.ex:1012
+#: lib/claper_web/live/event_live/manage.ex:1028
+#: lib/claper_web/live/event_live/manage.ex:1070
 #, elixir-autogen, elixir-format
 msgid "Resource not found"
 msgstr ""
@@ -2889,3 +2889,57 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Sign in to manage your presentations."
 msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:336
+#, elixir-autogen, elixir-format
+msgid "Could not regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:403
+#, elixir-autogen, elixir-format
+msgid "Could not start thumbnail regeneration"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:64
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:52
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:72
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:59
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available. Regenerate them?"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:66
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the presentation preview sidebar."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:54
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the slide sidebar preview."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:78
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:65
+#, elixir-autogen, elixir-format
+msgid "Regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:77
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:64
+#, elixir-autogen, elixir-format
+msgid "Regenerating..."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:400
+#, elixir-autogen, elixir-format
+msgid "Thumbnail regeneration started"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:325
+#, elixir-autogen, elixir-format
+msgid "Thumbnails regenerated successfully"
+msgstr ""
diff --git a/priv/gettext/en/LC_MESSAGES/default.po b/priv/gettext/en/LC_MESSAGES/default.po
index d1fd570..2ac2b29 100644
--- a/priv/gettext/en/LC_MESSAGES/default.po
+++ b/priv/gettext/en/LC_MESSAGES/default.po
@@ -16,7 +16,7 @@ msgstr ""
 #: lib/claper_web/live/admin_live/user_live.html.heex:41
 #: lib/claper_web/live/admin_live/user_live.html.heex:104
 #: lib/claper_web/live/admin_live/user_live/form_component.ex:18
-#: lib/claper_web/live/event_live/manage.ex:914
+#: lib/claper_web/live/event_live/manage.ex:989
 #: lib/claper_web/live/form_live/form_component.html.heex:32
 #: lib/claper_web/live/user_settings_live/show.html.heex:18
 #: lib/claper_web/templates/user_registration/new.html.heex:63
@@ -685,7 +685,7 @@ msgstr ""
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:74
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:234
 #: lib/claper_web/live/admin_live/oidc_provider_live/form_component.ex:24
-#: lib/claper_web/live/event_live/manage.ex:913
+#: lib/claper_web/live/event_live/manage.ex:988
 #, elixir-autogen, elixir-format
 msgid "Name"
 msgstr ""
@@ -1061,7 +1061,7 @@ msgstr ""
 msgid "Create your next presentation with"
 msgstr ""
 
-#: lib/claper_web/live/event_live/manage.ex:23
+#: lib/claper_web/live/event_live/manage.ex:25
 #: lib/claper_web/live/event_live/presenter.ex:26
 #: lib/claper_web/live/event_live/show.ex:38
 #, elixir-autogen, elixir-format
@@ -1326,12 +1326,12 @@ msgstr ""
 msgid "Try logging in again"
 msgstr ""
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "No"
 msgstr ""
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "Yes"
 msgstr ""
@@ -2413,7 +2413,7 @@ msgstr ""
 msgid "Audience Responses"
 msgstr ""
 
-#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:34
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:45
 #, elixir-autogen, elixir-format
 msgid "Content"
 msgstr ""
@@ -2518,7 +2518,7 @@ msgstr ""
 msgid "No settings available for this interaction"
 msgstr ""
 
-#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:107
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:131
 #, elixir-autogen, elixir-format
 msgid "No slide available"
 msgstr ""
@@ -2652,10 +2652,10 @@ msgstr ""
 msgid "Resource Type"
 msgstr ""
 
-#: lib/claper_web/live/event_live/manage.ex:894
-#: lib/claper_web/live/event_live/manage.ex:937
-#: lib/claper_web/live/event_live/manage.ex:953
-#: lib/claper_web/live/event_live/manage.ex:995
+#: lib/claper_web/live/event_live/manage.ex:969
+#: lib/claper_web/live/event_live/manage.ex:1012
+#: lib/claper_web/live/event_live/manage.ex:1028
+#: lib/claper_web/live/event_live/manage.ex:1070
 #, elixir-autogen, elixir-format
 msgid "Resource not found"
 msgstr ""
@@ -2887,3 +2887,57 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Sign in to manage your presentations."
 msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:336
+#, elixir-autogen, elixir-format
+msgid "Could not regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:403
+#, elixir-autogen, elixir-format
+msgid "Could not start thumbnail regeneration"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:64
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:52
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:72
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:59
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available. Regenerate them?"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:66
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the presentation preview sidebar."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:54
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the slide sidebar preview."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:78
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:65
+#, elixir-autogen, elixir-format
+msgid "Regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:77
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:64
+#, elixir-autogen, elixir-format
+msgid "Regenerating..."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:400
+#, elixir-autogen, elixir-format
+msgid "Thumbnail regeneration started"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:325
+#, elixir-autogen, elixir-format
+msgid "Thumbnails regenerated successfully"
+msgstr ""
diff --git a/priv/gettext/es/LC_MESSAGES/default.po b/priv/gettext/es/LC_MESSAGES/default.po
index a85cae8..5a2c6e2 100644
--- a/priv/gettext/es/LC_MESSAGES/default.po
+++ b/priv/gettext/es/LC_MESSAGES/default.po
@@ -16,7 +16,7 @@ msgstr "Configuración"
 #: lib/claper_web/live/admin_live/user_live.html.heex:41
 #: lib/claper_web/live/admin_live/user_live.html.heex:104
 #: lib/claper_web/live/admin_live/user_live/form_component.ex:18
-#: lib/claper_web/live/event_live/manage.ex:914
+#: lib/claper_web/live/event_live/manage.ex:989
 #: lib/claper_web/live/form_live/form_component.html.heex:32
 #: lib/claper_web/live/user_settings_live/show.html.heex:18
 #: lib/claper_web/templates/user_registration/new.html.heex:63
@@ -685,7 +685,7 @@ msgstr "Formulario"
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:74
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:234
 #: lib/claper_web/live/admin_live/oidc_provider_live/form_component.ex:24
-#: lib/claper_web/live/event_live/manage.ex:913
+#: lib/claper_web/live/event_live/manage.ex:988
 #, elixir-autogen, elixir-format
 msgid "Name"
 msgstr "Nombre"
@@ -1061,7 +1061,7 @@ msgstr "¿Cuándo empezará tu evento?"
 msgid "Create your next presentation with"
 msgstr "Crea tu siguiente presentación con"
 
-#: lib/claper_web/live/event_live/manage.ex:23
+#: lib/claper_web/live/event_live/manage.ex:25
 #: lib/claper_web/live/event_live/presenter.ex:26
 #: lib/claper_web/live/event_live/show.ex:38
 #, elixir-autogen, elixir-format
@@ -1326,12 +1326,12 @@ msgstr "Recargue la página a la que está intentando acceder (no vuelva a envia
 msgid "Try logging in again"
 msgstr "Intente iniciar sesión de nuevo"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "No"
 msgstr "No"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "Yes"
 msgstr "Sí"
@@ -2413,7 +2413,7 @@ msgstr "Asistentes"
 msgid "Audience Responses"
 msgstr "Respuestas de la audiencia"
 
-#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:34
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:45
 #, elixir-autogen, elixir-format
 msgid "Content"
 msgstr "Contenido"
@@ -2518,7 +2518,7 @@ msgstr "Sin interacciones en esta diapositiva"
 msgid "No settings available for this interaction"
 msgstr "Sin ajustes disponibles para esta interacción"
 
-#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:107
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:131
 #, elixir-autogen, elixir-format
 msgid "No slide available"
 msgstr "Sin diapositiva disponible"
@@ -2652,10 +2652,10 @@ msgstr ""
 msgid "Resource Type"
 msgstr "Tipo de Respuesta"
 
-#: lib/claper_web/live/event_live/manage.ex:894
-#: lib/claper_web/live/event_live/manage.ex:937
-#: lib/claper_web/live/event_live/manage.ex:953
-#: lib/claper_web/live/event_live/manage.ex:995
+#: lib/claper_web/live/event_live/manage.ex:969
+#: lib/claper_web/live/event_live/manage.ex:1012
+#: lib/claper_web/live/event_live/manage.ex:1028
+#: lib/claper_web/live/event_live/manage.ex:1070
 #, elixir-autogen, elixir-format
 msgid "Resource not found"
 msgstr ""
@@ -2887,3 +2887,57 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Sign in to manage your presentations."
 msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:336
+#, elixir-autogen, elixir-format
+msgid "Could not regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:403
+#, elixir-autogen, elixir-format
+msgid "Could not start thumbnail regeneration"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:64
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:52
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:72
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:59
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available. Regenerate them?"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:66
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the presentation preview sidebar."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:54
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the slide sidebar preview."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:78
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:65
+#, elixir-autogen, elixir-format
+msgid "Regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:77
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:64
+#, elixir-autogen, elixir-format
+msgid "Regenerating..."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:400
+#, elixir-autogen, elixir-format
+msgid "Thumbnail regeneration started"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:325
+#, elixir-autogen, elixir-format
+msgid "Thumbnails regenerated successfully"
+msgstr ""
diff --git a/priv/gettext/fr/LC_MESSAGES/default.po b/priv/gettext/fr/LC_MESSAGES/default.po
index bf4325a..44dc272 100644
--- a/priv/gettext/fr/LC_MESSAGES/default.po
+++ b/priv/gettext/fr/LC_MESSAGES/default.po
@@ -16,7 +16,7 @@ msgstr "Paramètres"
 #: lib/claper_web/live/admin_live/user_live.html.heex:41
 #: lib/claper_web/live/admin_live/user_live.html.heex:104
 #: lib/claper_web/live/admin_live/user_live/form_component.ex:18
-#: lib/claper_web/live/event_live/manage.ex:914
+#: lib/claper_web/live/event_live/manage.ex:989
 #: lib/claper_web/live/form_live/form_component.html.heex:32
 #: lib/claper_web/live/user_settings_live/show.html.heex:18
 #: lib/claper_web/templates/user_registration/new.html.heex:63
@@ -689,7 +689,7 @@ msgstr "Formulaire"
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:74
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:234
 #: lib/claper_web/live/admin_live/oidc_provider_live/form_component.ex:24
-#: lib/claper_web/live/event_live/manage.ex:913
+#: lib/claper_web/live/event_live/manage.ex:988
 #, elixir-autogen, elixir-format
 msgid "Name"
 msgstr "Nom"
@@ -1065,7 +1065,7 @@ msgstr "Quand votre événement commencera-t-il ?"
 msgid "Create your next presentation with"
 msgstr "Créez votre prochaine présentation avec"
 
-#: lib/claper_web/live/event_live/manage.ex:23
+#: lib/claper_web/live/event_live/manage.ex:25
 #: lib/claper_web/live/event_live/presenter.ex:26
 #: lib/claper_web/live/event_live/show.ex:38
 #, elixir-autogen, elixir-format
@@ -1330,12 +1330,12 @@ msgstr "Rechargez la page à laquelle vous essayez d'accéder (ne renvoyez pas l
 msgid "Try logging in again"
 msgstr "Essayez de vous reconnecter"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "No"
 msgstr "Non"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "Yes"
 msgstr "Oui"
@@ -2417,7 +2417,7 @@ msgstr "Participants"
 msgid "Audience Responses"
 msgstr "Réponses de l'audience"
 
-#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:34
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:45
 #, elixir-autogen, elixir-format
 msgid "Content"
 msgstr "Contenu"
@@ -2522,7 +2522,7 @@ msgstr "Aucune interaction sur cette diapositive"
 msgid "No settings available for this interaction"
 msgstr "Aucun paramètre disponible pour cette interaction"
 
-#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:107
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:131
 #, elixir-autogen, elixir-format
 msgid "No slide available"
 msgstr "Aucune diapositive disponible"
@@ -2656,10 +2656,10 @@ msgstr ""
 msgid "Resource Type"
 msgstr "Type de réponse"
 
-#: lib/claper_web/live/event_live/manage.ex:894
-#: lib/claper_web/live/event_live/manage.ex:937
-#: lib/claper_web/live/event_live/manage.ex:953
-#: lib/claper_web/live/event_live/manage.ex:995
+#: lib/claper_web/live/event_live/manage.ex:969
+#: lib/claper_web/live/event_live/manage.ex:1012
+#: lib/claper_web/live/event_live/manage.ex:1028
+#: lib/claper_web/live/event_live/manage.ex:1070
 #, elixir-autogen, elixir-format
 msgid "Resource not found"
 msgstr ""
@@ -2891,3 +2891,57 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Sign in to manage your presentations."
 msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:336
+#, elixir-autogen, elixir-format
+msgid "Could not regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:403
+#, elixir-autogen, elixir-format
+msgid "Could not start thumbnail regeneration"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:64
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:52
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:72
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:59
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available. Regenerate them?"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:66
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the presentation preview sidebar."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:54
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the slide sidebar preview."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:78
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:65
+#, elixir-autogen, elixir-format
+msgid "Regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:77
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:64
+#, elixir-autogen, elixir-format
+msgid "Regenerating..."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:400
+#, elixir-autogen, elixir-format
+msgid "Thumbnail regeneration started"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:325
+#, elixir-autogen, elixir-format
+msgid "Thumbnails regenerated successfully"
+msgstr ""
diff --git a/priv/gettext/hu/LC_MESSAGES/default.po b/priv/gettext/hu/LC_MESSAGES/default.po
index 80c5307..bac46c0 100644
--- a/priv/gettext/hu/LC_MESSAGES/default.po
+++ b/priv/gettext/hu/LC_MESSAGES/default.po
@@ -16,7 +16,7 @@ msgstr "Beállítások"
 #: lib/claper_web/live/admin_live/user_live.html.heex:41
 #: lib/claper_web/live/admin_live/user_live.html.heex:104
 #: lib/claper_web/live/admin_live/user_live/form_component.ex:18
-#: lib/claper_web/live/event_live/manage.ex:914
+#: lib/claper_web/live/event_live/manage.ex:989
 #: lib/claper_web/live/form_live/form_component.html.heex:32
 #: lib/claper_web/live/user_settings_live/show.html.heex:18
 #: lib/claper_web/templates/user_registration/new.html.heex:63
@@ -685,7 +685,7 @@ msgstr "Űrlap"
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:74
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:234
 #: lib/claper_web/live/admin_live/oidc_provider_live/form_component.ex:24
-#: lib/claper_web/live/event_live/manage.ex:913
+#: lib/claper_web/live/event_live/manage.ex:988
 #, elixir-autogen, elixir-format
 msgid "Name"
 msgstr "Név"
@@ -1061,7 +1061,7 @@ msgstr "Mikor kezdődik az esemény?"
 msgid "Create your next presentation with"
 msgstr "Hozza létre következő prezentációját ezzel:"
 
-#: lib/claper_web/live/event_live/manage.ex:23
+#: lib/claper_web/live/event_live/manage.ex:25
 #: lib/claper_web/live/event_live/presenter.ex:26
 #: lib/claper_web/live/event_live/show.ex:38
 #, elixir-autogen, elixir-format
@@ -1326,12 +1326,12 @@ msgstr "Töltse újra az elérni kívánt oldalt, de ne küldje újra az adatoka
 msgid "Try logging in again"
 msgstr "Jelentkezzen be újra"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "No"
 msgstr "Nem"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "Yes"
 msgstr "Igen"
@@ -2413,7 +2413,7 @@ msgstr "Résztvevők"
 msgid "Audience Responses"
 msgstr "Közönség válaszai"
 
-#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:34
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:45
 #, elixir-autogen, elixir-format
 msgid "Content"
 msgstr "Tartalom"
@@ -2518,7 +2518,7 @@ msgstr "Nincs interakció ezen a dián"
 msgid "No settings available for this interaction"
 msgstr "Nincsenek elérhető beállítások ehhez az interakcióhoz"
 
-#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:107
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:131
 #, elixir-autogen, elixir-format
 msgid "No slide available"
 msgstr "Nincs elérhető dia"
@@ -2652,10 +2652,10 @@ msgstr ""
 msgid "Resource Type"
 msgstr "Válasz típus"
 
-#: lib/claper_web/live/event_live/manage.ex:894
-#: lib/claper_web/live/event_live/manage.ex:937
-#: lib/claper_web/live/event_live/manage.ex:953
-#: lib/claper_web/live/event_live/manage.ex:995
+#: lib/claper_web/live/event_live/manage.ex:969
+#: lib/claper_web/live/event_live/manage.ex:1012
+#: lib/claper_web/live/event_live/manage.ex:1028
+#: lib/claper_web/live/event_live/manage.ex:1070
 #, elixir-autogen, elixir-format
 msgid "Resource not found"
 msgstr ""
@@ -2887,3 +2887,57 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Sign in to manage your presentations."
 msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:336
+#, elixir-autogen, elixir-format
+msgid "Could not regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:403
+#, elixir-autogen, elixir-format
+msgid "Could not start thumbnail regeneration"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:64
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:52
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:72
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:59
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available. Regenerate them?"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:66
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the presentation preview sidebar."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:54
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the slide sidebar preview."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:78
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:65
+#, elixir-autogen, elixir-format
+msgid "Regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:77
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:64
+#, elixir-autogen, elixir-format
+msgid "Regenerating..."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:400
+#, elixir-autogen, elixir-format
+msgid "Thumbnail regeneration started"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:325
+#, elixir-autogen, elixir-format
+msgid "Thumbnails regenerated successfully"
+msgstr ""
diff --git a/priv/gettext/it/LC_MESSAGES/default.po b/priv/gettext/it/LC_MESSAGES/default.po
index 9fdce14..cf5cab1 100644
--- a/priv/gettext/it/LC_MESSAGES/default.po
+++ b/priv/gettext/it/LC_MESSAGES/default.po
@@ -17,7 +17,7 @@ msgstr "Impostazioni"
 #: lib/claper_web/live/admin_live/user_live.html.heex:41
 #: lib/claper_web/live/admin_live/user_live.html.heex:104
 #: lib/claper_web/live/admin_live/user_live/form_component.ex:18
-#: lib/claper_web/live/event_live/manage.ex:914
+#: lib/claper_web/live/event_live/manage.ex:989
 #: lib/claper_web/live/form_live/form_component.html.heex:32
 #: lib/claper_web/live/user_settings_live/show.html.heex:18
 #: lib/claper_web/templates/user_registration/new.html.heex:63
@@ -686,7 +686,7 @@ msgstr "Modulo"
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:74
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:234
 #: lib/claper_web/live/admin_live/oidc_provider_live/form_component.ex:24
-#: lib/claper_web/live/event_live/manage.ex:913
+#: lib/claper_web/live/event_live/manage.ex:988
 #, elixir-autogen, elixir-format
 msgid "Name"
 msgstr "Nome"
@@ -1062,7 +1062,7 @@ msgstr "Quando inizierà il tuo evento?"
 msgid "Create your next presentation with"
 msgstr "Crea la tua prossima presentazione con"
 
-#: lib/claper_web/live/event_live/manage.ex:23
+#: lib/claper_web/live/event_live/manage.ex:25
 #: lib/claper_web/live/event_live/presenter.ex:26
 #: lib/claper_web/live/event_live/show.ex:38
 #, elixir-autogen, elixir-format
@@ -1327,12 +1327,12 @@ msgstr "Ricarica la pagina che stai cercando di accedere (non reinviare i dati)"
 msgid "Try logging in again"
 msgstr "Prova ad accedere di nuovo"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "No"
 msgstr "No"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "Yes"
 msgstr "Sì"
@@ -2414,7 +2414,7 @@ msgstr "Partecipanti"
 msgid "Audience Responses"
 msgstr "Risposte del pubblico"
 
-#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:34
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:45
 #, elixir-autogen, elixir-format
 msgid "Content"
 msgstr "Contenuto"
@@ -2519,7 +2519,7 @@ msgstr "Nessuna interazione su questa diapositiva"
 msgid "No settings available for this interaction"
 msgstr "Nessuna impostazione disponibile per questa interazione"
 
-#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:107
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:131
 #, elixir-autogen, elixir-format
 msgid "No slide available"
 msgstr "Nessuna diapositiva disponibile"
@@ -2653,10 +2653,10 @@ msgstr ""
 msgid "Resource Type"
 msgstr "Tipo di risposta"
 
-#: lib/claper_web/live/event_live/manage.ex:894
-#: lib/claper_web/live/event_live/manage.ex:937
-#: lib/claper_web/live/event_live/manage.ex:953
-#: lib/claper_web/live/event_live/manage.ex:995
+#: lib/claper_web/live/event_live/manage.ex:969
+#: lib/claper_web/live/event_live/manage.ex:1012
+#: lib/claper_web/live/event_live/manage.ex:1028
+#: lib/claper_web/live/event_live/manage.ex:1070
 #, elixir-autogen, elixir-format
 msgid "Resource not found"
 msgstr ""
@@ -2888,3 +2888,57 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Sign in to manage your presentations."
 msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:336
+#, elixir-autogen, elixir-format
+msgid "Could not regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:403
+#, elixir-autogen, elixir-format
+msgid "Could not start thumbnail regeneration"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:64
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:52
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:72
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:59
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available. Regenerate them?"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:66
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the presentation preview sidebar."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:54
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the slide sidebar preview."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:78
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:65
+#, elixir-autogen, elixir-format
+msgid "Regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:77
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:64
+#, elixir-autogen, elixir-format
+msgid "Regenerating..."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:400
+#, elixir-autogen, elixir-format
+msgid "Thumbnail regeneration started"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:325
+#, elixir-autogen, elixir-format
+msgid "Thumbnails regenerated successfully"
+msgstr ""
diff --git a/priv/gettext/lv/LC_MESSAGES/default.po b/priv/gettext/lv/LC_MESSAGES/default.po
index c179c00..b3514b2 100644
--- a/priv/gettext/lv/LC_MESSAGES/default.po
+++ b/priv/gettext/lv/LC_MESSAGES/default.po
@@ -16,7 +16,7 @@ msgstr "Iestatījumi"
 #: lib/claper_web/live/admin_live/user_live.html.heex:41
 #: lib/claper_web/live/admin_live/user_live.html.heex:104
 #: lib/claper_web/live/admin_live/user_live/form_component.ex:18
-#: lib/claper_web/live/event_live/manage.ex:914
+#: lib/claper_web/live/event_live/manage.ex:989
 #: lib/claper_web/live/form_live/form_component.html.heex:32
 #: lib/claper_web/live/user_settings_live/show.html.heex:18
 #: lib/claper_web/templates/user_registration/new.html.heex:63
@@ -689,7 +689,7 @@ msgstr "Veidlapa"
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:74
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:234
 #: lib/claper_web/live/admin_live/oidc_provider_live/form_component.ex:24
-#: lib/claper_web/live/event_live/manage.ex:913
+#: lib/claper_web/live/event_live/manage.ex:988
 #, elixir-autogen, elixir-format
 msgid "Name"
 msgstr "Nosaukums"
@@ -1065,7 +1065,7 @@ msgstr "Kad sāksies jūsu pasākums?"
 msgid "Create your next presentation with"
 msgstr "Izveidojiet nākamo prezentāciju, izmantojot"
 
-#: lib/claper_web/live/event_live/manage.ex:23
+#: lib/claper_web/live/event_live/manage.ex:25
 #: lib/claper_web/live/event_live/presenter.ex:26
 #: lib/claper_web/live/event_live/show.ex:38
 #, elixir-autogen, elixir-format
@@ -1330,12 +1330,12 @@ msgstr "Atkārtoti ielādējiet lapu, kurai mēģināt piekļūt (neveiciet atk
 msgid "Try logging in again"
 msgstr "Mēģiniet vēlreiz pieteikties"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "No"
 msgstr "Nē"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "Yes"
 msgstr "Jā"
@@ -2417,7 +2417,7 @@ msgstr "Dalībnieki"
 msgid "Audience Responses"
 msgstr "Auditorijas atbildes"
 
-#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:34
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:45
 #, elixir-autogen, elixir-format
 msgid "Content"
 msgstr "Saturs"
@@ -2522,7 +2522,7 @@ msgstr "Nav mijiedarbību šajā slaidā"
 msgid "No settings available for this interaction"
 msgstr "Nav pieejamu iestatījumu šai mijiedarbībai"
 
-#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:107
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:131
 #, elixir-autogen, elixir-format
 msgid "No slide available"
 msgstr "Nav pieejamu slaidu"
@@ -2656,10 +2656,10 @@ msgstr ""
 msgid "Resource Type"
 msgstr "Atbildes veids"
 
-#: lib/claper_web/live/event_live/manage.ex:894
-#: lib/claper_web/live/event_live/manage.ex:937
-#: lib/claper_web/live/event_live/manage.ex:953
-#: lib/claper_web/live/event_live/manage.ex:995
+#: lib/claper_web/live/event_live/manage.ex:969
+#: lib/claper_web/live/event_live/manage.ex:1012
+#: lib/claper_web/live/event_live/manage.ex:1028
+#: lib/claper_web/live/event_live/manage.ex:1070
 #, elixir-autogen, elixir-format
 msgid "Resource not found"
 msgstr ""
@@ -2891,3 +2891,57 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Sign in to manage your presentations."
 msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:336
+#, elixir-autogen, elixir-format
+msgid "Could not regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:403
+#, elixir-autogen, elixir-format
+msgid "Could not start thumbnail regeneration"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:64
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:52
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:72
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:59
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available. Regenerate them?"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:66
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the presentation preview sidebar."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:54
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the slide sidebar preview."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:78
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:65
+#, elixir-autogen, elixir-format
+msgid "Regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:77
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:64
+#, elixir-autogen, elixir-format
+msgid "Regenerating..."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:400
+#, elixir-autogen, elixir-format
+msgid "Thumbnail regeneration started"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:325
+#, elixir-autogen, elixir-format
+msgid "Thumbnails regenerated successfully"
+msgstr ""
diff --git a/priv/gettext/nl/LC_MESSAGES/default.po b/priv/gettext/nl/LC_MESSAGES/default.po
index 2931c8a..e4216f8 100644
--- a/priv/gettext/nl/LC_MESSAGES/default.po
+++ b/priv/gettext/nl/LC_MESSAGES/default.po
@@ -16,7 +16,7 @@ msgstr "Instellingen"
 #: lib/claper_web/live/admin_live/user_live.html.heex:41
 #: lib/claper_web/live/admin_live/user_live.html.heex:104
 #: lib/claper_web/live/admin_live/user_live/form_component.ex:18
-#: lib/claper_web/live/event_live/manage.ex:914
+#: lib/claper_web/live/event_live/manage.ex:989
 #: lib/claper_web/live/form_live/form_component.html.heex:32
 #: lib/claper_web/live/user_settings_live/show.html.heex:18
 #: lib/claper_web/templates/user_registration/new.html.heex:63
@@ -685,7 +685,7 @@ msgstr "Formulier"
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:74
 #: lib/claper_web/live/admin_live/oidc_provider_live.html.heex:234
 #: lib/claper_web/live/admin_live/oidc_provider_live/form_component.ex:24
-#: lib/claper_web/live/event_live/manage.ex:913
+#: lib/claper_web/live/event_live/manage.ex:988
 #, elixir-autogen, elixir-format
 msgid "Name"
 msgstr "Naam"
@@ -1061,7 +1061,7 @@ msgstr "Wanneer begint het evenement?"
 msgid "Create your next presentation with"
 msgstr "Maak je volgende presentatie met"
 
-#: lib/claper_web/live/event_live/manage.ex:23
+#: lib/claper_web/live/event_live/manage.ex:25
 #: lib/claper_web/live/event_live/presenter.ex:26
 #: lib/claper_web/live/event_live/show.ex:38
 #, elixir-autogen, elixir-format
@@ -1326,12 +1326,12 @@ msgstr "Herlaad de pagina die u probeert te openen (dien geen gegevens opnieuw i
 msgid "Try logging in again"
 msgstr "Probeer opnieuw in te loggen"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "No"
 msgstr "Nee"
 
-#: lib/claper_web/live/event_live/manage.ex:886
+#: lib/claper_web/live/event_live/manage.ex:961
 #, elixir-autogen, elixir-format
 msgid "Yes"
 msgstr "Ja"
@@ -2413,7 +2413,7 @@ msgstr "Deelnemers"
 msgid "Audience Responses"
 msgstr "Reacties van het publiek"
 
-#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:34
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:45
 #, elixir-autogen, elixir-format
 msgid "Content"
 msgstr "Inhoud"
@@ -2518,7 +2518,7 @@ msgstr "Geen interacties op deze dia"
 msgid "No settings available for this interaction"
 msgstr "Geen instellingen beschikbaar voor deze interactie"
 
-#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:107
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:131
 #, elixir-autogen, elixir-format
 msgid "No slide available"
 msgstr "Geen dia beschikbaar"
@@ -2652,10 +2652,10 @@ msgstr ""
 msgid "Resource Type"
 msgstr "Reactietype"
 
-#: lib/claper_web/live/event_live/manage.ex:894
-#: lib/claper_web/live/event_live/manage.ex:937
-#: lib/claper_web/live/event_live/manage.ex:953
-#: lib/claper_web/live/event_live/manage.ex:995
+#: lib/claper_web/live/event_live/manage.ex:969
+#: lib/claper_web/live/event_live/manage.ex:1012
+#: lib/claper_web/live/event_live/manage.ex:1028
+#: lib/claper_web/live/event_live/manage.ex:1070
 #, elixir-autogen, elixir-format
 msgid "Resource not found"
 msgstr ""
@@ -2887,3 +2887,57 @@ msgstr ""
 #, elixir-autogen, elixir-format
 msgid "Sign in to manage your presentations."
 msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:336
+#, elixir-autogen, elixir-format
+msgid "Could not regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:403
+#, elixir-autogen, elixir-format
+msgid "Could not start thumbnail regeneration"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:64
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:52
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:72
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:59
+#, elixir-autogen, elixir-format
+msgid "No thumbnails are available. Regenerate them?"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:66
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the presentation preview sidebar."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:54
+#, elixir-autogen, elixir-format
+msgid "Regenerate them to restore the slide sidebar preview."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:78
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:65
+#, elixir-autogen, elixir-format
+msgid "Regenerate thumbnails"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage_slide_preview_component.ex:77
+#: lib/claper_web/live/event_live/manage_slide_sidebar_component.ex:64
+#, elixir-autogen, elixir-format
+msgid "Regenerating..."
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:400
+#, elixir-autogen, elixir-format
+msgid "Thumbnail regeneration started"
+msgstr ""
+
+#: lib/claper_web/live/event_live/manage.ex:325
+#, elixir-autogen, elixir-format
+msgid "Thumbnails regenerated successfully"
+msgstr ""
diff --git a/test/claper/presentations_test.exs b/test/claper/presentations_test.exs
index 9610521..d305bd1 100644
--- a/test/claper/presentations_test.exs
+++ b/test/claper/presentations_test.exs
@@ -40,6 +40,28 @@ defmodule Claper.PresentationsTest do
       assert presentation_file.hash == "4567"
       assert presentation_file.length == 43
     end
+
+    test "missing_slide_thumbnails?/1 returns true when thumbnails are missing" do
+      storage_dir = unique_storage_dir()
+      put_local_storage_config(storage_dir)
+
+      presentation_file = presentation_file_fixture(%{hash: "missing-thumbs", length: 2})
+
+      assert Presentations.missing_slide_thumbnails?(presentation_file)
+    end
+
+    test "missing_slide_thumbnails?/1 returns false when thumbnails exist" do
+      storage_dir = unique_storage_dir()
+      put_local_storage_config(storage_dir)
+
+      presentation_file = presentation_file_fixture(%{hash: "existing-thumbs", length: 2})
+
+      thumbs_dir = Path.join([storage_dir, "uploads", presentation_file.hash, "thumbs"])
+      File.mkdir_p!(thumbs_dir)
+      File.write!(Path.join(thumbs_dir, "1.jpg"), "thumb")
+
+      refute Presentations.missing_slide_thumbnails?(presentation_file)
+    end
   end
 
   describe "presentation_states" do
@@ -61,4 +83,27 @@ defmodule Claper.PresentationsTest do
                Presentations.update_presentation_state(presentation_state, update_attrs)
     end
   end
+
+  defp put_local_storage_config(storage_dir) do
+    previous_storage_dir = Application.get_env(:claper, :storage_dir)
+    previous_presentations = Application.get_env(:claper, :presentations)
+
+    Application.put_env(:claper, :storage_dir, storage_dir)
+
+    Application.put_env(
+      :claper,
+      :presentations,
+      Keyword.merge(previous_presentations || [], storage: "local")
+    )
+
+    on_exit(fn ->
+      File.rm_rf!(storage_dir)
+      Application.put_env(:claper, :storage_dir, previous_storage_dir)
+      Application.put_env(:claper, :presentations, previous_presentations)
+    end)
+  end
+
+  defp unique_storage_dir do
+    Path.join(System.tmp_dir!(), "claper-test-#{System.unique_integer([:positive])}")
+  end
 end
diff --git a/test/claper_web/live/event_live_test.exs b/test/claper_web/live/event_live_test.exs
index c47b533..e067c5d 100644
--- a/test/claper_web/live/event_live_test.exs
+++ b/test/claper_web/live/event_live_test.exs
@@ -62,6 +62,28 @@ defmodule ClaperWeb.EventLiveTest do
     end
   end
 
+  describe "Manage" do
+    setup [:register_and_log_in_user, :create_event]
+
+    test "prompts to regenerate missing thumbnails and starts regeneration", %{
+      conn: conn,
+      presentation_file: presentation_file
+    } do
+      Oban.Testing.with_testing_mode(:manual, fn ->
+        {:ok, manage_live, html} = live(conn, ~p"/e/#{presentation_file.event.code}/manage")
+
+        assert html =~ "No thumbnails are available"
+        assert html =~ "Regenerate thumbnails"
+
+        manage_live
+        |> element(~s{button[phx-click="regenerate-thumbnails"]})
+        |> render_click()
+
+        assert render(manage_live) =~ "Thumbnail regeneration started"
+      end)
+    end
+  end
+
   describe "Join" do
     test "renders the join page", %{conn: conn} do
       {:ok, join_live, html} = live(conn, ~p"/")