If you have a local copy of your video that you want to upload and it isn't a mp4 file, you can convert your video to a mp4 using one of a variety of video conversion software option. One example of a video conversion software is iSkysoft. A short tutorial on converting video using iSkysoft video converter can be found at https://videoconverter.iskysoft.com/guide/video-converter-mac/convert-video.html.