Add "Fallback Image" to "Google Web Designer" for Double Click banner ad
I am using Google Web Designer to create DoubleClick ad in HTML5.
DoubleClick's documentation says HTML5 ads should have a "fallback image" for browsers that don't have the ability to run HTML5, however I can't find an explanation on how to add it anywhere in their documentation, or on Google.
What's the best way to add it?
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