The "Video" element allows you to embed clips from popular video sites or upload video files from your device.
Video embedding
Videos from YouTube, Facebook, Instagram, Vimeo, Dailymotion, Flickr, Hulu, Kickstarter, The New York Times, Ted and Vine are supported.
All you need is the URL of the video.
Video upload
Select the file from your device (phone, computer, etc.) and choose an image to use for the poster. The poster is what will be seen before the video has started. The size of the video (width and height) must match the size of the poster or have the same aspect ratio.