Jellyfin is very conveniently packaged in docker, so while it may seem daunting, I highly recommend at least trying that route.

Running an nfs mount, docker or not, should be perfectly fine. Jellyfin just uses normal storage so won’t care if it’s nfs. No real special considerations with proxmox either, especially without worrying about a dedicated GPU. Just spin up a Debian guest and go.

Why does this only work in Hondas? What about this cares about the car?

If you have a free pcie 4x or higher slot, you can throw in a cheap card to adapt to m.2 nvme, like 12 bucks. I’m running one in my older hp desktop that doesn’t have m.2 and it’s been working great.

We need more info on your permissions. 755 would mean anyone can read files there, but only the owner can write. If the owner isn’t the same user that mediawiki is running as, then uploads won’t work.

I do almost exactly the same, except I have opnsense running on a cheap dual nic mini PC so I don’t have that dependency on my proxmox servers. The unifi stuff does need a controller, but they publish a free app that you can run instead of getting their hardware.