How to add an audio into a video from a MP4 audio background video  ?

1. Upload an image    then move it then click once to freeze the position. Circle the image to rotate it

2. Upload a GIF image    then move it then click once to freeze the position

3. Upload a video   with an audio soundtrack from your device.

4. Move the image outside the canvas by the left (this is an easy hack).

5. Start to record with the audio track from the MP4 video as an audio background.

6. Let the audio play until the end then pause  and download your video

Here is “Video sample with the Deliverance movie soundtrack as an audio background”