Enable the histogram in djigo4, with the Mavic you are fixed in aperture, so you can only adjust ISO and shutter speed. You need to try to keep the histogram balanced to the center, or pushed a bit to the right, to the left and you are underexposed.
I would stay away from auto as it just pushes the ISO up to ranges that create too much digital noise (at least for me). The mavic much past ISO 400 is too noisy in the shadows/darker areas and the noise reduction applied creates too much of a painterly look. In low light Auto will take you into the ISO 800 and above ranges and the camera just can't handle the noise.
On the main screen of the djigo4 app, on the right side of the screen, look for the camera adjustment icon. Three horizontal lines with small circles. Click on this, and you can adjust a lot of your camera settings both in Video and stills.
The Mavic is a fixed wide open aperture, F 2.4 or 2.8, I can't remember which. So the only way to control your exposure (at base ISO of 100) is to increase the shutter speed. In your situation the shutter speed appears to be to high, so you can manually adjust it and see the effect your your video screen. In manual, you will have to make adjustments in flight as if you turn into the sun, you odds are will be over exposed.
Most folks will use a ND filter on the mavic due to the fixed aperture for video work to keep the shutter speed in a good range to the video FPS.
Paul C