Plex handles it like this:
Local extras can be located alongside the main movie file in a directory named for the movie. They’re indicated by using specific naming at the end of the filename. Local inline extras will be detected and used if named and stored as follows:
* `Movies/MovieName (Release Date)/Descriptive_Name-Extra_Type.ext`
Where `-Extra_Type` is one of:
* -behindthescenes
* -deleted
* -featurette
* -interview
* -scene
* -short
* -trailer
* -other
https://support.plex.tv/articles/local-files-for-trailers-and-extras/
Jellyfin might do the same
removed by mod