Method 1: 1. Take an Apple mobile phone as an example. Open the phone and click on the "iMovie" application that comes with the phone.

2. Enter the application and click the "Create Project" button, then click the "Video" option.

3. Import the video we shot into this application, and then click the "Create Video" button. After entering the My Videos page, click the "gear" icon in the lower right corner of the screen, and then turn on the "Theme Music" function. There are 7 music themes to choose from, corresponding to different background music, and then click on the upper right corner of the screen. "Done" button.

4. Return to the My Videos page, click the " " button on the left, then click the "Audio" option, and then select the music in your phone. After selecting, click "Done" in the upper right corner of the screen. " button.

5. After completing the above operations, you can add background music to the video.

Method 2: 1. Open the phone, click on the videoleap application, then import the video we shot, and then click on the "Audio" option at the bottom of the screen.

2. In it, we can choose our own music to edit into the background music of the video, and we can also choose sound effects to enrich our video effects, but this software can only use our iTunes music.

3. The powerful function of this application is that we select the video first, and then select the background music after the editing is completed.

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