Extras with Versions is possible - ONE WAY - and one way only… by starting from scratch and building a bundle from the ground up:
… and that means you can’t have three versions of a movie in the same folder with the extras. The version with the extras MUST be added first - and ALL OTHER versions of the movie MUST be added later - outside the folder with the movie and the extras, in unique folders of their own.
Also - if you expect to have ANY success in this endeavour - start first by naming your files properly. The way you’ve named Superman - I have no idea which Superman that is and If I don’t know - you probably had to Fix Match and you can’t be Fixing Match during this operation - that much is certain.
The first thing to do is:
Remove Superman and every file that has anything to do with Superman anywhere in your library system. Files/Folders/Extras/images - the works.
Scan Library
Empty Trash
Clean Bundles.
Now you may continue
Movie Name (YEAR).xxx <—that’s how you name movie files and if you want this to work that’s how you’ll name yours.
Rename/Restructure - in this order:
A Movie Library\
.....Superman (1978) [Theatrical]\ <-----First Version with all the Extras
........Superman (1978) [Theatrical].xxx
........extra one-tag
........extra two-tag
........and so on...
--WHEN THAT IS COMPLETELY DONE
.....Superman (1978) [Special Edition]\ <---Next Version--
........Superman (1978) [Special Edition].xxx
-- WHEN THAT IS COMPLETELY DONE
.....Superman (1978) [Extended Cut]\ <---Next Version--
........Superman (1978) [Extended Cut].xxx
Note:
All inside [Brackets] is ignored by Plex and the matching agent.
Make sure what’s outside the [Bracket] is perfect file name…
or give up now. Life is short. Do something you’ll enjoy more 'cause this won’t work otherwise.
If you did this right you should see extras in every version - if you split them - Plex probably merged them and if done right you can split them if you want to.
If your files are MP4/M4V - do this - before LMA throws you a live hand-grenade: