I want to buy an ipad mini 4 to fly my dji 3 pro using the Go app or possibly Litchi. I asked this before, but I was flying a standard 3 then. I've upgraded now to a pro 3. Do I need cellular or is wifi alone on the ipad mini 4 enough? Ive read the other threads, but found none that speak specifically to the 3 pro and ipad 4 mini. So, asking just to be sure. Im far from a techie. Thanks.