There is an android native GUI for syncthing in fdroid that looks like its still maintained: https://github.com/Catfriend1/syncthing-android?tab=readme-ov-file

If you want multiple VMs to use the storage on the ZFS pool, better to create it in proxmox rather than passing raw disks thru to the VM.

ZFS is awesome, I wouldn't use anything else now.

You have friends? What's that like?

You are right, generally, generative AI pirates art and the rest of the content on the internet.

ZFS?

Good now wipe it and install NixOS. You're ready.