Just to clarify… this is about accessing your media on the Synology from your Plex server which is hosted on a Linux machine?
If so, your issue is probably more about properly mounting the Syno share on your Linux server.
Depending on what sharing protocol you’re using, there’s different guides on how to properly achieve that:
- for SMB/CIFS shares → Linux Tips - #4 by ChuckPa
- for NFS shares → Linux Tips - #5 by ChuckPa
