Oh--the Incomplete and Music aren't files--they're folders. Now I see why I was confused!

Looks like your Music folder was renamed to some other name: it's the same one you found earlier.

To get that folder (whatever its name is) to show up in the Library, look in the options for the name of your "Saved Files folder". Then go to the section of the options that lists the Folders to be shared. Just choose --I think there's a "Browse" button--the folder to add it to the Shared list, and it will then show up in the Library.