How does Apple mobile phone add weather forecast background music to video?

The way to add music to a video with an Apple phone is as follows:

1. Open the photo album on the mobile phone desktop and find the video to add music to;

2. Click Edit in the upper right corner of the video, and then enter the editing state. In the editing state, you can only temporarily cut the length of the video;

3. Click on the three points below the video, and an iMovie will appear. We can edit music in iMovie:

4. After entering iMovie, click the sound sign to turn off the sound of the original video;

5. Then click on the music logo below, select bgm of weather forecast from your own music list, and click Use;

6. Then you can adjust the music below to make the rhythm more in tune, and then click Finish to export the video.