Hello and welcome aboard.
Here's a step by step instructions on how to do this.
(1) Connect your Android phone to your computer using the microUSB to USB cable.
(2) If you are using a PC, you will see an installation bubble pop up in the bottom right of your screen. Wait for the computer to successfully complete installation.
(3) The critical step: On your Android phone, pull down the notification window (aka ‘window shade’

and tap USB connected.
(4) A notification window will appear. Tap Mount. Your phone will enter USB storage mode.
(5) Find the removable storage drive. On a PC, navigate to My Computer and look for a new removable storage drive. On a Mac, the drive will appear on your desktop.
(6) Drag-and-drop the desired file(s) to the drive. In your phone’s notification window, tap Turn off USB storage.
(7) Unplug your phone and you’re all set.
I hope this works for you. Also, remember to stop in at your device's area of discussion...here is where you'll find some cool, informative, helpful tips on your device.