In December 2018, Gmail released annotation updates to their Promotions tab on mobile devices including: single image previews, deal badges, and custom logos. Show your customers a quick enticing preview right at the top of their inbox.
NOTE: Your email will display these features only when the message is a "Top Pick" in Gmail's Promotions tab.
ADDING MICRODATA TO YOUR EMAIL
If you're building an HTML email, simply add the applicable code directly inside the <body> tag.
If you're building an email with Composer, add an HTML component to your canvas and add the applicable code.
NOTE: These snippets can be added anywhere in your email, as they will not display in the message.