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Try to take a picture with the Capture button on your Smart Controller (soft touch buttons).
Watch the camera controller (Air Commander Entire) Camera Controller while taking a picture with the soft buttons. You should see a white flash every time you take a picture.
Check that the Entire Camera Control status light is blue. This means it is in the ready state.
Ensure your gimbal pitch is correct under the mission tab when planning your mission. The gimbal pitch selected is the angle the gimble will be set to while running the mission.
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