Cannot scan library

Many thanks for the pointers, @ChuckPa.

Reading here (Linux Tips - #3 by ChuckPa), I see that I can move the metadata library to a place of my choosing, and I think this is a good idea for my setup (with my music on an external disk, it seems best to store the metadata in the same place). But, my system has metadata I don’t want to lose in the old location. If I create that override.conf file, and change the location of the metadata, do I lose the existing metadata? Is it moved for me? Do I need to move it before making the change?