A question about my Xbox 360 and USB storage flash drive device?

I’m trying to transfer some videos I sent to my USB flash drive from my computer. To go from that flash drive to my Xbox 360. However, all I ever get is everything is empty with 0 kb when you go into the USB storage device on my 360 system. When I went into the storage option, it says I have stuff in there, but when I get inside it shows 0 kb meaning it’s empty. I just used a new flash drive I bought today. What should I do to make it operable for my Xbox 360 so that I can transfer those videos to my system? Thanks.