Hi Jim.
I got it to work, but not very smoothly.
After pressing the add music button on my pono the transfer came on, but switched off again with the device drive not recognized message.
But I tried it again numerous times, and sometime it would let me transfer the file. Other times it would not.
In one case it only took one song from an album. But after repeated tries I managed to transfer three full albums.
Yikes.
I'll keep you posted if there are new developments.
Regards, CJ