1. First, enter the directory C:\users\administrator\documents\rockstargames\gtav and find the user music folder. This folder is the path to the user-defined music file, as shown in the figure below.

2. Then, find the folder where you want to add music, as shown in the figure below.

3. Next, right-click the folder where the music is located and select "Create Shortcut", or add the music file directly, as shown in the figure below.

4. Then, copy this shortcut or music file to the user's music folder, the path is C:\users\administrator\documents\rockstargames\gtav, as shown in the figure below.

5. Next, click to open GTAV and enter the game, as shown in the picture below.

6. Then, press the Esc key in the game, and then select "Settings Menu" in the pop-up menu, as shown in the figure below.

7. Next, find the "Sound" option in the settings menu and select this option, as shown in the figure below.

8. Then, select the "Quick Scan Music" option to start scanning the just added music files. If the file is too large, it will take a long time to scan, as shown in the figure below.

9. Finally, after scanning, in the game, long press the q key to bring up the radio options, and select "from radio" to play the music just added to the local, as shown in the figure below.