The export method and detailed operation steps are as follows:

1. First, select and open the [QQ Music] application on the mobile phone, as shown below, and then proceed to the next step.

2. after completing the above steps, on the homepage of the opened [QQ Music] application, select the [My] menu option in the lower right corner of the open page, and then select the [Local] option in the [My] options page, as shown below, and then proceed to the next step.

3. after completing the above steps, select the [...] icon on the right of the file to be opened, as shown below, and then proceed to the next step.

4. Then, after completing the above steps, select the [Upload to weiyun] option, and the background file will upload the selected file to weiyun, as shown below, and then proceed to the next step.

5. Then, after completing the above steps, open the [Tencent weiyun] client software on the computer side, and click the [Directory] option on the left side of the page, and then you can find? The [QQ Music] folder is on the right side of the interface, as shown below, and then go to the next step.

6. Finally, after completing the above steps, open the [QQ Music] folder and you can see the files uploaded by your mobile phone. After selecting a file, click the [Download] option at the top of the page to complete the file export, as shown below. In this way, the problem is solved.