How does WeChat make video clips?

The method of making video clips by WeChat is as follows:

Tools/materials: Apple iphone 13, IOS 15.3, WeChat 8.0. 18.

1. Open WeChat, click Discover, and then click Friends Circle.

2. Click the camera icon in the upper right corner.

3. Click to shoot.

4. Press and hold the middle circle to shoot. A green progress bar will appear when shooting. When the green progress bar scrolls to a circle, you can't shoot any more, because it's time limit for video. After shooting, you can release the button and click on the lower right corner to finish.

5. Add text as needed, and then click Publish.