Jellyfin doesn't seems to scan subfolders

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You will have to change how you sort your media.
It may be a deal breaker for you.

Yes, it maybe be a (little) problem for me, as I need to rethink about my whole library (or, at least, multiple movies inside the same collection).

I’ve read the link you shared, and tried several methods to keep more movies in the same folder. I can do it, but then I don’t know how to manage the extras. Or, at least, how to organize extras to keep their original names.

Example:
Episode IV.mkv

It seems I can create something like:
Episode IV - [original].mkv
Episode IV - [35mm].mkv
Episode IV - [Despecialized].mkv

But I guess they will be considered variants of the movie (like they are, to be honest) instead of extras (I like to have them not so evident, as I’m not watching them that often).
And, if I use the “- scene” suffix, I’m not able to give them a specific name.

Anyway I’ll be experimenting a bit more about it. For the moment many thanks for the explanation.

Have a nice day.