1 If your screen is locked, unlock your screen. 2  Connect your computer to your device using a USB cable. 3  If you need to select a USB connection option on your device, choose Media device (MTP) . 4  Locate music files on your computer and drag them into your device's Music folder in Android File Transfer. Connect your computer to your device using a USB cable. 2  If you’re prompted to select a USB connection option on your device, select Media device (MTP) . 3  Locate music files on your computer and drag them into your device's Music folder.