I'm trying to figure if it is possible to use images as merge tags when creating an email campaign. I am creating a newsletter template for a real estate company, and I want the appropriate brokers photo to appear depending on which client the newsletter is sent to. Ideally, the image located could be plugged into some code already inside the email temple:

<img src="https://creator.zoho.com/ngalluzzo21/test-capture/Contact_View/Image_1/image/$[UD:SITE]$" >

However, it appears this code keeps getting removed form the "Insert HTML" section. Is it not allowed? Am I using the wrong permeant link? Is is possible to sync a picture or the link to it from Creator and use inside Campaign?