I'm using Wholphin as a client which should just work with v12 but I've not had time to update yet.
I've only really been using jellyfin for a month or two but it's much more user friendly than the xbmc/kodi setup I was using, and the pause/resume between devices is fantastic. I'm totally converted.
I can also recommend Wholphin if it is available (and you are the type of person who actually allows your TV to connect to a network). It's much faster than the official(?) jellyfin android client.
Interesting! I have been using the Jellyfin addon for Kodi as my main client, but it would be interesting to try Android TV again on the same device, since I 90% only use it for things on Jellyfin. How is the music player on it?
I only used it for a short while - from memory there was no seek, but it could have just been because my chrome tv remote didn't have seek buttons, long press next/previous didn't work.
I've only really been using jellyfin for a month or two but it's much more user friendly than the xbmc/kodi setup I was using, and the pause/resume between devices is fantastic. I'm totally converted.