I have a Samsung Galaxy 10.1 Model GT-P7510 upgraded to Honeycomb 3.1, with the official new USB adapter, model EPL-1PL0BEGSTA, part GH69-13448A. It recognizes mice and keyboards, but not cameras and USB thumb drives. I have several thumb drives with various file systems, including mostly FAT32 (which should work). All of them incorrectly appear empty.