Want to put a video into an email? It is easier than it sounds. You can't put a video directly in an email; instead, you add a thumbnail image. When they click the picture, it takes them to the video.
Once you have started a new email, here is how it works:
Add an Image Block to your email
Click on the Image Block, and you will see the information about this specific picture pop up on the right
Under the 'Build' option, click 'Replace' and choose the image you would like to be the thumbnail for this video
Now, to add the link for the video, click 'Link Type'
Choose 'Web Address'
Paste the URL to your video in the Link box below
Save, then close, and you will have a video connected to the picture within the email.