You are able to play Mp4 and Youtube videos during your live webinar. There are two ways to load your video files for your webinars.
1. Pre-load your video file(s) before your webinar opens (Highly recommended)
To pre-load videos for your webinar, go to the "Manage Webinar" tab on your webinar page and click the "Pre-load Files and Videos" section on the lefthand side of the page. From there you'll be able to click the "Add Video" button and add video files to share during your live webinar.
2. Load the video files during the live webinar
To load your videos during your live webinar click the "Video" button at the top right corner of your webinar room. Then, browse your computer for your Mp4 file OR paste the YouTube link.
Both pre-loaded files and new files can be shared from this video pop-up. Either load your video (left side of screenshot) OR click "Play" next to the video you want to share (right side of screenshot).
Video tutorial here:
(Please note that both pre-loaded and on-the-fly videos can be added/shared from the same place.)