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I have never had an issue with properly named files.

Some tools to help with bulk renaming.

Krename

Link - github.com/KDE/krename

Useful for bulk renaming uniform files. I often use it to add the season when the file names just have the episode number.

Filebot

Link - www.filebot.net

Great for renaming messy files. You can match the show name then it will try to get the season, episode and episode name

MediaElch

Link - mediaelch.github.io/mediaelch-doc/index.html

Excellent for pulling the metadata for a show into local nfo files.

Once you have the show name, season and episode number you can scrape TVDB or other sites for the episode data, thumbnails, actors, posters, etc

I then have Jellyfin use the local metadata that MediaElch has created.