I have an iPad mini 5. And use Arch as my PC OS.>let me transfer my own music and video files from my PC?
ifuse-git from the AUR lets works for mounting an application's storage. Transfer speeds are serviceable. >if not, can I mount my NAS share in iOS and play the files back using an app of my choice? what network file sharing protocols are supported?
SMB is supported in the files app. VLC supports DLNA (jellyfin/plex) and accessing files over SMB.>is there a video player app that has good codec support similar to MX Player on Android or mpv or vlc on PC?
Only one I tried was VLC and it was fine.>can I easily disable cloud services or does it constantly nag me to save my own files on Apple's servers? (or worse, does it do it automatically without asking?)
Although the device is clearly built for Apple's services you can just not use or not agree to the terms & conditions for most of them. Nextcloud integration is surprisingly good with the app.>is there a browser that supports ad blocking like Firefox on Android?
Brave.>does Safari still suck?
Didn't try it.>can I do YouTube background play so my videos play in a small window while I use other apps?
Great little media consumption device.