diff --git a/lib/changelog/schema/episode/episode.ex b/lib/changelog/schema/episode/episode.ex
index 756b5ef4eb..4df86f6a97 100644
--- a/lib/changelog/schema/episode/episode.ex
+++ b/lib/changelog/schema/episode/episode.ex
@@ -227,6 +227,8 @@ defmodule Changelog.Episode do
     |> validate_format(:socialize_url, Regexp.http(), message: Regexp.http_message())
     |> validate_published_has_published_at()
     |> validate_all_email_fields_together()
+    |> validate_audio_file_no_plusplus()
+    |> validate_plusplus_file_yes_plusplus()
     |> unique_constraint(:slug, name: :episodes_slug_podcast_id_index)
     |> cast_assoc(:episode_hosts)
     |> cast_assoc(:episode_guests)
@@ -537,4 +539,24 @@ defmodule Changelog.Episode do
       changeset
     end
   end
+
+  defp validate_audio_file_no_plusplus(changeset) do
+    audio_file = get_field(changeset, :audio_file)
+
+    if audio_file && String.contains?(audio_file.file_name, "++") do
+      add_error(changeset, :audio_file, "this looks like a ++ mp3 (filename)")
+    else
+      changeset
+    end
+  end
+
+  defp validate_plusplus_file_yes_plusplus(changeset) do
+    plusplus_file = get_field(changeset, :plusplus_file)
+
+    if plusplus_file && !String.contains?(plusplus_file.file_name, "++") do
+      add_error(changeset, :plusplus_file, "this doesn't look like a ++ mp3 (filename)")
+    else
+      changeset
+    end
+  end
 end
diff --git a/lib/changelog_web/templates/admin/episode/_form.html.heex b/lib/changelog_web/templates/admin/episode/_form.html.heex
index 6848e4bc00..77e484ce5a 100644
--- a/lib/changelog_web/templates/admin/episode/_form.html.heex
+++ b/lib/changelog_web/templates/admin/episode/_form.html.heex
@@ -307,6 +307,7 @@
     <% end %>
 
     <%= file_input(f, :audio_file) %>
+    <%= AdminHelpers.error_message(f, :audio_file) %>
   </div>
 
   <% has_audio_chapters = Enum.any?(f.data.audio_chapters) %>
@@ -422,6 +423,7 @@
     <% end %>
 
     <%= file_input(f, :plusplus_file) %>
+    <%= AdminHelpers.error_message(f, :plusplus_file) %>
   </div>
 
   <% has_plusplus_chapters = Enum.any?(f.data.plusplus_chapters) %>