Plex on web browser can see content but not play it

Server Version#: 8.2.10
Player Version#:
I just rebuilt my Plex server. It’s now running in a Proxmox container, amd accesses files from an OMV node on the same node. I’m not a Linux expert by any means and it took some hard graft, but when I went back into the web browser to rebuild my music library, it found everything. All the artists and albums I’d expect are back. But they won’t play! “Please check that the file exists and the necessary drive is mounted”.

To which I would say… if the file didn’t exist and the drive wasn’t mounted, how did you add it to the library?

Any ideas on where I start trouble shooting this?

I should add… I can get to the files on OMV through windows, and they play. And whilst I was following my Youtube helper video last night. I could see the files through the mount on the container. I left Plex overnight building the library. Since which time, there’s been a power outage. The plex container and OMV came back up, but would the power down have killed the mounts in the plex container?

Going to bet its a permissions issue. Plex scan see the file name, but cant open it.

The solution to this was not one I like. I went back into the command line to check out whether all the parts of the mounting process were still in place. They weren’t. I went back through the video I’d used to set this up and had to repeat some of the lines, then it worked again.

Having poked around the net for adjacent problems since posting, it would seem I’m not the first to lose a mount after losing power. If it’s the power going off that did this, that’s disturbing. I’m not faffing around like this every time the power goes off. I think we’re at the end of the loop in my village, we do get power burps semi-regularly. If it happens again I’ll bin the container and do something else.

All this not Plex’s fault though!

This is one of the reasons I do not like containerization. Running this on the host OS its fairly simple to edit your fstab (or equivalent) and automatically address this.