@KristiM5
Thank you for reaching out to the Community. That is a great question! I'm sorry to hear your video thumbnail is not populating as it should be, but I do have a work around for you. Instead of copying the full URL at the top of the page, click where it says Share at the bottom right corner below your video, and copy the short URL link. Usually when you add that to your email, the thumbnail will generate for you.
If that does not work for you, please email us at social_support(at)constantcontact(dot)com with your username, the email campaign name, the Youtube video URL, and a reference to this post and I would be happy to take a look into this!
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