With the Marshmallow update, the default USB mode is charge only. Once you connect the phone and computer via the USB cable, pull down the notification shade, tap where it says USB Charging, then change it to File Transfer.
With the Marshmallow update, the default USB mode is charge only. Once you connect the phone and computer via the USB cable, pull down the notification shade, tap where it says USB Charging, then change it to File Transfer.