You can reach server settings for Mac PMS? That’s good.
Is the server claimed? In the General section it should say “Server claimed by your_email_address” just like for the Syno PMS.
Next Steps (only if Mac PMS is claimed):
Let’s simplify things. Make sure Mac PMS is working correctly.
Login to Mac PMS.
Create an Other Videos library and add a folder on the Mac that has at least one video.
Mac PMS should display the video in the library. It won’t try to match it to any online metadata, so artwork, etc won’t be there.
Now stream it to your phone, tv, browser on a different system, etc. You may need to logout/login to the Plex app on the phone, etc. for it to pick up the new server.
That will prove Mac PMS is working and can stream to other devices.
Once that works you can proceed to working with the SMB shares from the Synology.
Regarding those SMB shares…
The Synology SMB shares must be mounted on the Mac before Mac PMS can create libraries with them.
The Synology login you use to mount the shares must have at least read-only access to the media.
You may also need to give Mac PMS permission to access the files in
System Preferences > Security & Privacy > Privacy > Full Disk Access & Input Monitoring & Files & Folders.
References:
- Plex Media Server Mac not finding content - #2 by etalgoy
- How to Fix or Repair Disk Permissions in macOS
Now see if you can create a library in Mac PMS using the SMB shares from the Synology.
This will test that the access permissions are OK.
Don’t worry if the exact poster, etc. is different than Syno PMS. You can also disable thumbnail generation, credit detection, etc. on Mac PMS.
We’re just testing that Mac PMS can correctly access the media files on the Synology NAS.
