Jellyfin does not detect all movies

[Pascal]

Hi  
I did not find any solution for my problem.
Jellyfin does not detect all my movies.

I am using best practice names for all of my movies and folders like: 
Media/Movies/Movie (2021) [imdbid-tt12801262]/Movie (2021) [imdbid-tt12801262].mkv or .mp4
https://jellyfin.org/docs/general/server/media/movies/

I tried Plex just for fun and it detects every movie.
Is there anything I can do to find the missing movies and the reason why they are missing?

[TheDreadPirate]

For some reason the forum did not show me this thread in my feed.

What OS are you running and how is Jellyfin installed? Can you share your jellyfin logs via pastebin?

Does the jellyfin user have permissions to read your folders?