The looping of the autoplay video can be controlled from the Output box located in the Summary screen. As per the image below shows.
Autoplay videos are set to loop by default. Checking the Disable box will result in the autoplay video only playing once and then coming to a stop on the last frame.
HINT: We recommend leaving the autoplay video on loop to allow viewers to comeback to the video, after browsing the email, without missing any of the message or Call To Action (CTA).
PLEASE NOTE: Any changes you make to the set up of the video will require you to update the HTML snippet, from the Embed menu, to capture the changes for your email.