Today, users can include pre-determined images as part of their emails. This is accomplished by including the URLs for these images in a single select drop down). The image input is not used as users can then include non-approved emails.
It would be helpful for users to be able to see a preview of the images without needing to toggle back and forth between the form and the preview sections. Maybe have an 'image gallery' type input?
As a bonus, it would be great to be able to bulk upload allowed images to that image gallery.