How do you replace the audio of a video file?

To remove the original audio track and add a new audio track to the video, do the following:

1. Click Add Media to import video and audio files to the collections first .
2. Drag and drop the video from the Media collection to the timeline.
3. Right click the video and select Audio Detach to separate the audio track from the video.
4. Select the audio track and remove it by clicking the Delete button.
5. Drag and drop the new audio file from the Media collection to the audio track on the timeline.
6. Edit the audio and drag it to anywhere you want on the timeline.

Now you're able to edit audio and video tracks together. When finished editing, you can export them to one file through the Export menu.