Update from OP…
selecting a a single folder and sending it to my iPad worked. I had to rename the copied folder with the Artists name, 3 Doors Down, but the mp3s were all there.
this could be a tedious task with so many folders and sub folders …
tried copying a folder with 2 sub folders , the iXpander App just went into a hang mode.
maybe it doesn’t like Alicia Keyes ?
thank you.