The picture did not upload. I clicked on the picture and could see it.
One more step.
In File Station, right click on /homes.
Then choose Properties and the Permissions tab.
Make sure the permissions look correct for PlexMediaServer.
Also check the box at the bottom of the window for “Apply to this folder, subfolder, & files.”
Then Save.
/PlexMediaServer is reserved for use by the Plex Media Server application. That is where the database, etc. is stored. Never place any media in /PlexMediaServer.
Plex had to make several changes between DSM 6 and DSM 7.
Plex now runs under the PlexMediaServer username. It is also a system internal user, not a regular user.
You need to give user PlexMediaServer at least read only access to your media locations. See FAQ #29 linked in my earlier post.
Also give Installation & Setup of Plex Media Server on Synology a read.
