1. Recording and matching music can be completed through the mobile phone software Recording Expert. First, open the Recording Expert software and click the edit button here.

2. Then click the soundtrack button.

3. Then you need to click the first button to select a music from the music library.

4. Select a music from the music library.

5. Or click the second button, where you can search for music recording files locally from the recording expert.

6. After clicking, you need to click the search button.

7. Find the desired background music file through keywords.

8. The third button below the main soundtrack interface can select the recently played recording file as background music.

9. After opening the file, select a played music file here.

10. Finally, you need to click the mix button in the interface to complete the soundtrack.