No problem, most games I’ve tried run without much fuss just with proton enabled. For others, protondb is great (pointed in the right direction to get Jade Empire running) or fiddling with settings yourself, gamescope helps a lot even if I’ve found it has some issues with nvidia cards (had games freeze with hdr for example), more of my issues are probably related to having an ultrawide tbh.
Jellyfin does support dlna as well