If you just bought the new DJI Phantom 4, you will want to connect it to your Android smartphone or tablet. But if you don’t enable USB debugging and also change the connection mode, the DJI Go app may not recognize your Android device.
Transferring files from USB flash drive to your Android device might be useful when you don’t have your PC with you. For example, you want to get some files from your friend’s phone. In this case you can use a USB flash drive to easily transfer files to your Android device, this method has variety of uses and this is just one example.