Hi, Not new to drones, but new to the spark. Can't seem to fully connect without wifi. I've watched countless YouTube videos and I am just not able to connect without wifi using controller and OTG cable. I can get it to fly, but my DJI GO APP won't show any video unless I turn on wifi. Is there a special sequence of turning things on? Tried a android device and iPad mini and get same results. Appreciate any help anyone can give. I noticed using wifi really runs the batteries on mobile device down quick.