Custom file downloads for specific posts?

Does DOIFD allow a unique download for every post opt-in it’s added to, or is it a static file for all opt-ins like most email providers offer?

Looking for a way to make podcast audio files require opt-in to download, and the audio file would be specific to that WordPress post.

Thanks!

https://www.ads-software.com/plugins/double-opt-in-for-download/