Mr Trev
Headphoneus Supremus
I think Noodles5666 is jerking you all around. I seen something like this in the X3 forum for SD cards and they would not give no details about how it worked. The only thing I've got to work is a OTG cable with a flash drive. Will be getting a 256 flash drive Friday. Hope it works.
No great mystery to how they work. You plug on end into the microsd slot. Put a full size sd card in the other.
Haven't tried one yet myself, but I've read in the other threads they work just fine. Standard disclaimers: use a quality card, that's about all