The use case is that a customer could register their product and upload a picture of their receipt and product. We then listen for that and create a case in our NetSuite application from that information. I know you can upload images through the Messenger already, but I did not think you could (nor have I found a way) to get those images out of Intercom.
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I know you can do POST and PUT actions in the custom action, but it appears you have to pre-fill the information, which is not sufficient for what I need to do.