Flash drive not showing files
I recently had my computer reimaged (I bought it out from my university) and used a flash drive to temporarily save my files (I've done this every time I've gotten a new computer and never had problems). I have an 8 GB Maxflash thumb drive that when I plug it into my computer, the flash drive shows up but none of the files do. The "get info" tab shows that there is about 5 GB of files stored on the flash drive. How do I recover these files?
MacBook Air, OS X El Capitan (10.11.4)