If you have more than one place for music but only one of those does regularly alter the content pressing “Update” or “Rescan” on My Music will affect all your partitions which is not really effective. Those buttons should appear for clicking next to the partitions I really want to update or rescan, not affecting automatically all partitions.
This is a new feature claimed on last release 2.323 as of November 18 2017.
I am interested too, but i can’t find anything in WEBUI to do that, nor explanation here on how do it.
How we can do a “Selective folder scanning”?