Add a MP3 music background to a video

How to add a MP3 music background to a video ?

  1. As the video source was filmed on a smartphone change the screen size 
  2. Upload the MP4 video
  3. Upload the MP3 music file Your video will start automatically to record
  4. Let the video play until the end and Download your video

Here is the video with a MP3 background music made with

Audio source :

Video source :

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