If I may augment?
If the PMS server is a Linux, then either of these two methods would work.
https://forums.plex.tv/t/how-to-mount-media-from-your-nas-shares-on-linux-using-cifs-smb/197957
https://forums.plex.tv/t/how-to-mount-media-from-your-nas-shares-on-linux-using-nfs/197947
If the PMS server is on the Synology itself, here is a How-To for the Synology
(Scroll down to the part about adding media)
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