I'm fairly new to flying, have about 20 flights total thus far and not too experienced at troubleshooting hence my Q: I can see all my camera's settings on my ST16, everything's connected fine but the camera view shows as pure black. Yes, the camera cover is off. I go through the binding process and everything looks right except no camera view on my screen. Before this happened, I took off without an SD card and my view was fine and normal. After realizing my error, I landed and powered-down the drone but kept the ST16 on and inserted the card. Then I cleaned to lens cover of the camera with my shirt, not pressing too hard while tilting the aircraft past a 45 angle. I mention all circumstances in case a more experienced pilot recognizes this as a calibration error or something about cleaning the camera. Please help.