It's kinda hard to edit the song lyric slides when your sync client isn't syncing the folder…

“boiling coffee's fix is: highlight the item you want to add to your drive and press SHIFT-Z on your keyboard, it brings up the “add to” menu.”

https://superuser.com/questions/1319157/some-windows-10-uwp-icons-not-displaying-on-search-or-in-settings