From the support article linked by ChuckPa:
- Our mobile apps (Android and iOS) can be used for free, but have limitations.
- Until the mobile app is unlocked (through an in-app purchase or a Plex Pass subscription), video and music streamed from a Plex Media Server has a 1 minute limit, and photos will be watermarked.
If you never unlocked it (one-time activation or Plex Pass membership) and it had worked for you before… count yourself lucky and consider it an Easter gift from Plex.
https://support.plex.tv/articles/205556278-unlocking-or-activating-plex-for-ios/
