If the arch wiki doesn’t have the answer, I just give up

Louis Rossmann made a video about it noday I think. They (apparently) don’t serve 4k in browsers, only if you use their propietary apps and allow to send them all your data

I use jellyfin a lot for anime, no plugins. I just label all my folders like kaguya_sama_[tmdbid-12345].

As long as the The Movie DB id is there, aboslutely no problems indexing.