There are two possibilities for showing video. A direct link to the mp4 or m4v file can be set if you have the source video. This will use HTML5 for displaying the video. Alternatively you can insert an iFrame or direct share Link from YouYube or Vimeo this is by far the easiest option.
EMBED or paste Share Link (Default)
Ensure the radio button next to embed code / Share Link is checked.
Share Link (Easiest)
Paste the share link in the text box this is by far the easiest option to add video. The link will be in the form for YouTube https://youtu.be/-CmadmM5cOk YouTube Help Vimeo Help
Embed Code
The embed code is generated by Youtube or Vimeo and will need to be copied exactly to the EMBED code box. Update the height and width to the recommended settings displayed to fit with the layout on the page.
Video Image - This does not apply to embed code video. The video from you tube or vimeo will be displayed.
HTML 5 Video File
Ensure the radio button next to HTML5 Video File is checked.
If you know the URL to where the mp4 or m4v video file is located enter here. The URL must start with http://. Ensure the radio button next to Video File Link is checked.
Video Image - Image uploaded and added here will be shown in the video player window before the movie starts.