1. Connect the mobile phone to your computer by the USB cable. And from the mobile phone, drug down the screen from top to open the notification window, and select "USB connected", see below image:
2. Choose "Turn on USB storage" from the next page. see below image:
3. From the computer, you will see new disk appears. If there is 2 new disk, one is the mobile internal storage, another is the memory card storage. You can select the one which you want to copy files.