Speaking of third party apps, here’s some recommendations:
Android: Findroid
Works absolutely great, it’s very rare that I even find a bug.
iOS: Swiftfin
I don’t use iOS but this is the one I installed on my friend’s phones.
Linux (and maybe Windows): Delfin
This is a GTK 4 app for Linux and maybe it has a Windows build too but I didn’t check. It’s not perfect, there’s bugs here and there but it mostly works fine. The developer isn’t very active (which is understandable), so it would be nice if someone, who has the time for it, would help out.
Here’s also the official page with Jellyfin clients: https://jellyfin.org/downloads/clients/all
It doesn’t seem to include Delfin though.






But those are just for music, that’s why I didn’t list them. I assume most people use Jellyfin (or Plex) for video content.