Finally got to where I could go test it, been a long couple of days. BTW - great-grandson Charlie finally made his entrance around 4PM yesterday, 6# 11oz 20 inches long. He and my granddaughter are doing great.
Back to my testing, latest DJI Go 4 app on an iPad mini 4 running the latest iOS version. The OTG cable worked flawlessly. I completely shut down everything (AC, RC & iPad) between flights. All of the settings including the button assignments were retained. All of the telemetry was there and working. Probably because the last time I flew it outdoors there were leaves on the trees, it went out 950 feet 100 feet altitude vs. around 800 feet out at 100 feet altitude.