Hi, I just gotta a new Sandisk 32 gb SD card for this ZTE Z815 but it's nearly worthless. When I put it in it started working right away, but hardly anything is on it. I made sure to switch save location to SD. The only choice is to eject, and it still says low memory. I don't know how that could be, with 8 + 32 or 40 GB. Please help.