Since PMS-1.25.0.5282-2edd3c44d-x86_64_DSM7 no new content found

[ChuckPa]

Linux keeps permissions very strictly enforced.

All you need to do is grant (add) “PlexMediasServer” permission to read

This is a How-To which sets all permissions in the shared folder containing media.
It saves the need to identify files one by one.

DSM 7 - Plex Media Server - Release Info & Migration instructions

DSM 7 - Set permissions for (Media) Shared Folders. Often, when upgrading, changing permissions from Plex to PlexMediaServer is overlooked. Sometimes, folders have mismatched permissions within them. Here is how you remedy the problem. That message you see at the end of installation is a reminder to you to go check and provides the instructions how to remedy it. It may not address all problems but does address the vast majority. File Station → Right-click the shared folder → Proper…