On the return type page, you have the option to upload an icon that your customers can see in the portal. This icon accompanies the name of the return type, to further inform the customer about the return they are about to create.
To upload an icon go to the return type update page in the admin settings panel and scroll down. You are able to select an image (jpg or png) as you icon.
After selecting your preferred image (note the image resolution, it needs to be 140 pixels by 140 pixels) press the blue submit button in the bottom right to upload it.
Your return type image is now visible to your customers.