This article will provide an explanation of why you cannot insert videos in iFrames into a CivicSend eNewsletter.
You cannot enter HTML embed codes from videos into any CivicSend messages, including iFrame links or HTML buttons.
Adding video creates issues in CivicSend:
Adding video can increase the likelihood that your CivicSend messages will be auto-filtered into Spam folders
Some subscribers may have certain websites, such as YouTube, blocked at their workplace, so videos will not be able to play.
Some embedded iFrames will not display correctly within the Newsletter format
Resolution
You can add an image link to a page where the video is embedded, which will allow subscribers to view the video.