OrderlyEmails allows you to add sections to your emails, including images and GIFs. Here's how:

1- Login to OrderlyEmails (Shopify admin -> Apps)
​
2- Click the "Customize" button on your design

3- In the editor, go to the "Email Sections" tab

4- Click "Add section" at the bottom of the sections list

5- Select the "Image" section and click "Add"

6- Upload your image file.