The "cloudy" option just affects white balance. For low light, you need a slow shutter speed, and correspondingly, a slow flight speed in order to not have image blur.
I need to use my DJI Phantom 4 RTK to fly and photograph the floor of a narrow valley that is fully shaded until about 9am or so. I'll prepare a photogrammetric point cloud using 3DSurvey for image processing. There are tall trees and the...