How does DJI Royal Mavic Air turn on the gradient mode in the one-button short film function?

Click "Fade out", drag the distance bar to select the aircraft to fade out, press GO, and the App will automatically record the video, which can achieve a cool selfie effect. After shooting in mode, the plane will automatically fly back to its original shooting position. Click the "X" icon on the left to exit this mode, and the system will automatically generate a short video of 10s. Click the play button, especially in asteroid mode, the played video will be played from far to near, and click Share in the upper right corner to share the currently selected short video or original video.