I read the entire Spark manual but it does not mention using the OTG cable to directly connect the RC to the tablet. I have an iPad mini 4 cellular. It works fine, can connect and have flown when the iPad is connected to the RC via WiFi. But as soon as I use an OTG cable to connect the iPad to the RC it shows the Spark as being disconnected and of course, I get no video from the Spark. It does have the green light on the controller but DJI GO 4 shows the Spark as being disconnected. I have tried airplane mode, as well as just WiFi, turned off. Bluetooth has always been off. I have even tried a different Apple cable for the iPad.