On NextCloud 30 and trying to install OnlyOffice, Do they both need to be on the same LXC?

Hi everyone, I’m relatively new to Self-Hosting and I’m unsure what the most important information is but I’ll try and keep it brief

  • Installed NextCloudPi on my Proxmox LXC on Server A, which is connected to the LAN.
  • Installing OnlyOffice Document Server on another Proxmox LXC on Server B, also connected to the LAN.
  • For like a few days they were chill and working enough, didn’t have live multi-editing but could at least create files and then send them off all within nextcloud.
  • Suddenly connection started failing and whenever I tried to re-establish connection I keep getting this issue: Error when trying to connect (Error occurred in the document service: Error while downloading the document file to be converted.) (version 8.3.2.19)

I’m unsure what’s wrong