1, open the incision and add materials.

2. Turn off the original sound, select the ratio of 9: 16, and move the video to the top.

3. Add a second video to the picture-in-picture, adjust the video size and put it in a suitable position.

4. Add the following video to the picture-in-picture.

5. Adjust the position and exit.

6. Re-import the video, choose a favorite background, make a key frame at the beginning of the video, move the video to the bottom, drag the video to a suitable position, drag the video from bottom to top, make a key frame where you want to pause, and then follow this operation.