I am doing something similar to the coffee mug example you have here.
The problem I am having is that the URL for the complete image (base + overlay) stays the same but the overlay image is being constantly changed by the user. That causes a cache issue since after the first time the user has chosen the overlay image - it will always be the same (unless it will be uploaded with a different id which is an unwanted solution). Is there anyway to provide the version of the overlay image or any other way around it?
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