I bought 2 (cheap) 32 GB USB 2.0 data sticks, and when I try to upload a couple of different 5-6 GB HD video files onto them, I get a message saying the files are too large for this format. Any guesses what is going on here? Nothing on the package said anything about formatting. Generally these work right out of the box, I think. I tried zipping the files, got the same message. Any tips are appreciated.