Are you using an iPhone/iPad? Many mp4s don't work in browsers there. You may need to get an app that will play them. Long-press the mp4 link above the video, select download, then open the download in the app. Tedious, but it works.
Are you using an iPhone/iPad? Many mp4s don't work in browsers there. You may need to get an app that will play them. Long-press the mp4 link above the video, select download, then open the download in the app. Tedious, but it works.