My Droid turbo is not showing files to transfer to computer. It connects and shows on my computer but doesn't show any files. I have tried a different cable, restarting phone and computer, and different USB port. I can't find the the USB sharing option on this phone and it doesn't pop up on phone when I connect it to the computer. I have done this multiple times with this phone but it won't let me today. My storage is getting full so I need to backup and delete pictures. Thanks