To create a video with multiple audio tracks, you need:

• Original video
• Audio tracks in .mp3 format
• The MKVToolNix program (open-source)

5 easy steps to upload a video with multiple voiceovers:

1. Check that your audio tracks are in .mp3 format. If not, use an audio file converter, such as Convertio

1. Next, download and install the MKVToolNix program. There are versions available for Windows and macOS.