Extras in some folders not detected

[Mr_Generic]

Thank you for the follow-up and sharing that information.  I didn't realize it would show up under "Play Trailer".  It wasn't documented that way (https://jellyfin.org/docs/general/server/media/movies/), and I assumed it would just show up under "Sepecial Features" with all the other extras.

Here's what I can confirm now:

When using the web client:

• When you have a folder/file for a trailer, I can see the trailer when I click the "Trailer" button next to the "Play" button.
  
• When there is no trailer folder/file, clicking the "Trailer" button will play a video from YouTube.
  

When using the Roku client:

• When you have a folder/file for a trailer, I can see the trailer when I select "Play Trailer".
  
• When there is no trailer folder/file, the "Play Trailer" option is not visible.  I can't even play a trailer from YouTube.  But I believe this would be a Roku Jellyfin Client issue.  I can take it up with that project's developers.
  

And here is an updated summary of what does NOT work.  I can live with this    but not sure if it either needs to be fixed later or if the documentation needs to be updated.

Folders:

• clips
  
• other
  

File extensions:

• other
  

Thanks again for your help,
- Bob