I had a lot of trouble jellyfin and anime until I started putting things into season folders, even if they only had one season. So if I had Ano Hana I'd put the episodes in a folder like this
MediaDisk/Anime/AnoHana/Season 1/episodes_here
If it's a movie, then it goes into a folder with other movies.
Media Disk/Anime Movies/movies_here
Once I started doing that, Jellyfin automatically recognized most Anime.
I already do this, everything in my media is extremely cleanly named because they are handled by sonarr
series name/season 00/EPSxxExx-"episode title"
so it's not a file format issue. It gets a lot of them but there are certain things especially if they are recently aired or currently airing where it will simply fail to find a match until I give it the Japanese name at which point it manages to find the metadata for the English name. Really stupid stuff like that
I had a lot of trouble jellyfin and anime until I started putting things into season folders, even if they only had one season. So if I had Ano Hana I'd put the episodes in a folder like this
Media Disk/Anime/Ano Hana/Season 1/episodes_hereIf it's a movie, then it goes into a folder with other movies.
Media Disk/Anime Movies/movies_hereOnce I started doing that, Jellyfin automatically recognized most Anime.
I already do this, everything in my media is extremely cleanly named because they are handled by sonarr
series name/season 00/EPSxxExx-"episode title"
so it's not a file format issue. It gets a lot of them but there are certain things especially if they are recently aired or currently airing where it will simply fail to find a match until I give it the Japanese name at which point it manages to find the metadata for the English name. Really stupid stuff like that