Hello @ElaineS35 ,
There's a few ways you can link a button in such a way:
Upload the coupon image into your library, copy the URL for it, link your button to that URL.
Add the coupon image to a custom landing page, activate the CLP and copy its share URL, link the button to the URL.
Add the coupon image to a specific webpage on your site, link the button to that webpage.
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