Inserting images or GIFs into your emails can enhance the overall visual appeal of your email designs. Add an image or GIF to a new or existing email design, or a design template.
To add an image or GIF
Email Communication > Email Designs > Edit > Insert Image > Upload File > Image Width > Add Image.
Inserting Videos
Inserting and sending videos in emails is not recommended. Different email clients render embedded videos differently creating inconsistent experiences for guests.
Additional Resources
Email Design Resources
Change Image Size, And Create Responsive Images In Emails
Email Center Articles