If it's under 4GB, it should work.Did anyone find a solution?
I'm having almost the same problem. I upgraded my sd card to a larger one (64gb), and formatted it to fat32.
Now I'm unable to move my 3.71gb ultra moon .cia file to the sd card with the message that it's 'too large for the volumes format'.
Any way to circumvent this? (I'm on a mac)