First, don’t place TV Shows under Movies. They must be kept separately. You cannot mix Movies and TV shows in the same library. The Plex Movie scanner/agent will not correctly recognize TV shows, and the Plex TV Show scanner/agent will not correctly recognize movies.
Use something like this instead.
/Media/Movies
/Media/TV shows
Next, try setting permissions using File Station.
- In Synology File Station, right click on the shared folder
Media
and choose Properties. - On the Permission tab, make sure user PlexMediaServer has at least read permissions.
Edit the permissions if necessary.
If PlexMediaServer is not listed, see FAQ 19: Setting permissions to allow Plex access to media files. - Check the box for
Apply to this folder, sub-folders and files
and click Save.
You should now be able to add the folders to a Plex library.