Plex server does not see subfolders of Shared folder

[ChuckPa]

To add to @FordGuy61

This is how you address sub-folder and file permissions for DSM 7

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 → Propert…