in fact the kingston 32GB card suggested by grimulkan
https://www.mobileread.com/forums/showthread.php?t=48256
works fine in my device
(he also reports one 16 GB card that does not seem to work)
as far as I remember, there is someone who reported that cards formatted with linux file format (ext2) also work in the DR, here it is :
https://www.mobileread.com/forums/sho...highlight=ext2