Moon+ Reader and new SD Card (Marshmallow)

Hi,

I recently got a new and larger SD Card. I copied all the files from the older card into the new one, but Moon+ Reader is not able to find the files in the new card.
Seems like the "name" of the card changed from 27F9-AF5B to 96V3-KB7S, so since the "name" of the card is part of the path it makes it impossible for Moon+ Reader to find the books.

Is there a way around this issue? can we rename the card?

Or do I have to re-import all my books? (quite large number I must say)

Thanks