1. You need to activate the audio track before dragging audio to the Timeline. First, you must open "PR" on the computer.

2. After opening, when dragging the video, as shown in the figure below, only the video track is active (the active track will be displayed in gray).

3. In this case, dragging the video can only drag the video file.

4. You need to click "A 1" in front of the audio timeline to activate it.

5. In this way, video and audio can be dragged into the timeline at the same time.