Need to have visitor put in their email ID before taking them to an asset.

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Hi all, I have a basic question. I have a digital asset that I want to make it available for free in exchange for users email ID. I want to introduce a flow where once a user clicks on button, a pop-up asks for their name and email ID. After submission, the experience takes them to the digital asset. How do I go about it? What is the least technically complex approach for this. Please advise.