I didn't find the answer to this in any of the help center information...
We're a small nonprofit with a major conference coming up. Our very talented freelance graphic designer will be creating thematic promotional materials for the event. We'd like to know how we can upload/incorporate/distribute our professionally designed pieces and send them out via Constant Contact. We don't want to have just a clickable thumbnail or a link to a landing page! We'd like to have our graphic designer's work be revealed when a recipient opens the email. Thank you for any feedback and guidance!
I can understand how important it is to display your designer's work! The good news is you do not have to limit your image to a thumbnail size. Our email campaigns do allow users to not only insert images into an email, but to also resize it to be full width. Have you tried including a full size version of the image instead of a small thumbnail?