Unique White Paper download links for CMS blog posts?

I’ve written a series of article previews using Webflow’s CSM and would like to link each article with a unique white paper download link, but can’t seem to make this work.

I created both link and preview fields within the article collection. Then I made a download form

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The ideal situation would be to reference the url from the CMS link field in the form settings’ “Redirect URL”, howver that doesn’t appear to be an option.

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My backup method, was to reference this url within the success message, but the link doesn’t appear as an option.

Has anyone else had similar problems or know a solution?