Plex Your Changes Cannot Be Saved (UGreen NAS via Docker)

Server Version#: 1.43.1.10611

I have moved my Plex server onto my UGreen NAS through the official Plex Docker Container. I’ve got all my Metadata on there, but I’m trying to link the file locations for the media, and every time I try to edit to locate the files in their new location I’m getting a message that says “your changes cannot be saved.” Is there any way I can fix this so I can play my media on the NAS?