Austin Wade

I have an mp4 video that has multiple audio tracks. I recorded it from OBS so that my discord audio, mic audio, and game audio would all be on different audio tracks. Problem is, when I load the mp4 file into videopad, it only loads in the first audio track and I cannot figure out how to get the other two in there. I am inexperienced with this software, so If anyone could please explain in detail how to do this that would be fantastic. Thanks