Plex Installed - How to I move my Library?

Thank you for your response! Unfortunately, I am quite illiterate when it comes to Umbrel OS…how do I open a command prompt? Or execute the run command you’ve described? And what exactly does it do?

I set up Syncthing to get the file onto the device, but apparently that folder isn’t visible to Plex for some reason? Plex not detecting Syncthing folder