Local mp4 video uploads

We do not currently support embedding .mp4 videos, however, we do have some workarounds:

We do not currently support embedding .mp4 videos. If you do not use YouTube, Facebook, or Vimeo, you can add a link to your video. The best way is to insert a thumbnail and then link the thumbnail to a video file you have uploaded online. An example would be Google Drive and adding a public share access link on the thumbnail. 

Learn more about sharing via Google Drive. 
Learn more about adding links to images.