Hi there! Now that the editor has the ability to add text to images, it's as simple as uploading the button background shape and using the text tool in the image editor to add whatever the button language should be. Then you can link that text to your survey. Here's a quick screencast to show how that works.
Does this mean the only way to insert a button into an Emma campaign is by doing so with an image - meaning for Outlook clients, they will never see the button unless they "download images?" Is there another way to insert a call to action button?