Video block
Video options: choose where the video is located (YouTube, Vimeo, Local)
Video local: add link to video that is uploaded to Optimizely
YouTube: add the url of the video to external links (I.e. https://www.youtube.com/embed/VIDEOID)
Vimeo: add the url of the video to external links (I.e. https://player.vimeo.com/video/VIDEOID)
Example of YouTube embedded link, correct link part highlighted:
NOTE! If your video isn't visible, check in Global settings that the main url of your iframe video is added to Content Security Policy list.

