Well that’s a shame. I’m sort of half-assedly using syncthing to backup my photos from my phone to my server, but mostly I rely on immich. I never really got the hang of using syncthing with my phone.

The only console I ever spent a lot of time with was the NES, so I’m not at all native to the modern XBox / Play Station controller with its 166 buttons. But I know that some games are best with a controller, so I bought a Steam Controller and an XBox controller. I made it most of the way through Nier Automata with the Steam Controller, but I put the game down for some reason or another. I also gave Hades (what I think was) a good effort, but I never made it out and I stopped caring.
The only game I’ve completed with a controller is Brothers: A Tale of Two Sons, which you really shouldn’t play with m+k, if it’s even possible. I’d never try to play an FPS with a controller.

Masochism, paranoia.

Another vote for Debian, and I’ll suggest you go ahead and install Jellyfin directly rather than messing with Docker.
https://jellyfin.org/downloads/server
I’d been running JF under Docker on my NAS, but when I moved to a new server I decided to just install it directly and it hasn’t been any problem at all. You’ll get a notification when it needs to be updated and it’s just a few clicks to do so. You won’t have to fight with Docker to get hardware acceleration working - which isn’t to say it won’t be a PITA, but it’s one less layer of complication.