Useful documents:
- Installation & Setup of Plex Media Server on Synology
- Synology FAQ - Questions, Answers, and How-To’s
The move from DSM 6 to DSM 7 forced Plex to make several changes in the way Plex Media Server runs on Synology NAS.
Two of the primary changes are:
- Plex Media Server now runs under the username PlexMediaServer, and is a system internal user, which is new for DSM 7.
- The Plex Data Folder is now PlexMediaServer instead of Plex.
Do not alter permissions for the PlexMediaServer shared folder. Doing so will impact correct operations of Plex Media Server.
Do not add media files anywhere in the PlexMediaServer shared folder. Doing so will impact correct operations of Plex Media Server.
On DSM 7 based NAS, the Plex shared folder and Plex user are no longer used by Plex Media Server. They can be deleted or used for other purposes.
Regarding file permissions, the system internal user PlexMediaServer needs at least read only access (read-write if you are using DVR, optimized versions, etc.). For additional information see FAQ 29 - DSM 7 - Give PlexMediaServer access to your media. As @djfriday13 mentions, be sure to check the box to “apply to this folder, sub-folders, & files.”
