Quite a few folks have experienced the “Uh oh… something’s not right” for older iOS / iPadOS versions, including myself. Never managed to clear the issue.
https://forums.plex.tv/t/plex-app-on-ipad-uh-oh-somethings-not-right-unable-to-access-anything
Sadly quite a few threads with the same issue, no real resolution. Can you confirm what type of iPad and version of iPadOS you are using?
