Been trying to copy some files from 1 exFAT drive to another, and there are some bugs. I apologize if this has been posted before, I've not the time to read this thread because major upheaval at my work has kept me away from here.
Managunz file manager - does not copy if the file, or combined size of multiple files, are larger than 1 gig, it claims that there is not enough space. Folders will not copy, regardless of the size of the file(s) inside.
Simple File Manager (bundled with multiMAN MOD) - does not copy ANY file. However, it seems you can copy form 1 exFAT to the same exFAT, and also from exfat to FAT32/NTFS and vice versa.