So I normally don't respond to posts due to me being difficult to play with but I gotta tell you, these guys are feeding you a line of crap by telling you that you need a "SPECIAL" cable. especially the one who thinks he's an apple expert and is stating that the cable that comes with the iPad Pro is only for charging. if that was true you wouldn't be able to sync your iPad Pro to your MacBook Pro while its connected via the cable, you'd only be able to sync it wirelessly. So telling you that you need a special data cable is BS and a waste of money. all you need is a little bit of patients (I know I spelled that wrong and I don't care). the same thing happened to me when I first got my iPad Pro and was searching everywhere for answers, I was a bit pised thinking I couldn't use my iPad Pro with my
Air 2 but I Calmed down and just went thru the steps. I turned everything off, turned on the controller first, the drone second, then I turned on the iPad and connected it to the controller USING THE CABLE HAT CAME WITH THE IPAD. I continued to browse the internets and after about 45 seconds EUREKA I could see the camera view on the screen of the iPad.
as long as you continue to keep them connected you can turn off your controller and drone, when you power them back on it boots up normally as if you're using your iPhone. disconnect the controller from the iPad and you'll have to wait those original 45-60seconds. ill attach a picture just to prove to all the nah sayers that I'm not Being you like they are. And no I'm not some new guy that doesn't know crap about drones, DJI sent me a notification stating that I'm on the top .3% of drone pilots GLOBALLY, I'll send a screen shot of that too. best of luck, as Abraham once said, you can't believe everything you read on the internet.