Could someone explain how to cache maps for offline use in the DJI Pilot app for iOS? I found in threads on here that you just need to zoom in around areas you plan to fly in with WIFI on. I did that, completely closed the app, then turned WIFI off on my iPad and went back into the app while having no Internet. I checked the areas that I had cached, and I could see them! The problem is that when I tried to check out those same areas a day later with no WIFI, I could not see them. Any ideas?