Moved form Windows to Pi - Unable to change file path

Hi,

I installed Plex on Raspberry Pi - Copied the Plex Media Server over and the metadata is all there, but the file paths for the folders are wrong.
I am unable to change this path to the Mounted USB Drive on the PI

If i add a new folder, then i can see the Mounted Drive, but not able to amend the existing Folders.

See https://support.plex.tv/articles/201370363-move-an-install-to-another-system/