I have read about the media transfer. My phone is recognized by media connection on my PC. I weno into my DCIM folder and I had a bunch of pics and videos. I exported them to my PC. Afterwards it was empty but on my phone in my gallery I still have 403 pics and 30 videos using up almost 7 gigs of space. My phone has insufficient space. How do I export the rest if the DCIM camera folder is empty? The pics and videos are recent as well.