New Clip+ Question

The new clip+ has 1.02.15a firmware and I believe that is the latest so no update required.

I usually transfer books - rips, Overdrive, Audible - by dragging and dropping.  I’m particularly

interested in why this machine should show the card as MSC because when I move this

card to any of my four Clip+ devices all the books show and will play. 

So far and I’ve tried twice no books are visible from this card on the new device.

Donna