Usb Flash Drive File Transfer apk content rating is Rated for 3+ and can be downloaded and installed on android devices supporting 12 api and above.
"Usb Flash Drive File Transfer allows you to transfer files without the need of having a rooted Android phone. Just drag and drop files between the upper grid (your phone) and the lower (the USB Flash drive device) to transfer files and entire folders between them.
USB Flash Drives must be formatted to FAT32.
The app is still in a early version so I would appreciate any suggestion and comment.