Can't find my Synology NAS on my nvidia shield pro PLEX server

Synology 1515+
Nvidia shield pro

I installed plex as a server on the nvidia shield pro. I created some folders for my movies in the plex app on it. But when I want to add the movies in the library on my pc I can’t find my synology. I can just find the folder on the shield itself.
In the settings on the shield I changed the PMS data storage location to both options but when I’m in plex I only see the map: sdcard. How can I find the maps on my synology? Of course I have the ethernet cable plugged in the shield.
Please help.

see connect to network storage.