i have 5 Samsung TVs. The plex works on all of them except my 55” series 8.
the plex app use to work on this tv. I’ve done the updates, remove the app, unplugged the tv, reset the modem etc..k
The plex comes up and the movies show up. It’s when you hit play it gives the “file format not supported”
I have the same tv and issue. I enabled Beta updates on my plex server and updated and it appears to have fixed the issue.