Give user plexmediaserver full control of the plex shared folder.
That is Step 4 in FAQ 27: Migrating from DSM 6 to DSM 7.
- Change the shared folder permissions using
a. Open Control Panel
b. Shared Folders
c. EDIT the Plex share
d. Permissions tab
e. Click Customize
f. Check all Administration
g. Check all Read
h. Check all Write
i. Click Done
j. Check ‘Apply to this folder, sub-folders, and files’.
j. Click Save (Applies shared folder permission changes)
k. – Now wait until all changes are applied
l. Click Save again to return to the Shared Folders app.
