Stan Store is built to sell things, digital products, courses, coaching calls. If all you need is one free resource that captures an email, a dedicated gating tool fits the job better than a storefront.
Notion and Google Docs sharing links don't support an email gate on their own. The easy fix is publishing the content as a gated page instead, or gating the page that reveals the doc's link.
The simplest way to require an email for a PDF is to stop hosting it on a public link. Upload it to a gated page instead: visitors see a preview, and the file unlocks after they give their email.
The usual lead magnet stack is a doc, a form tool, a Zap, and a spreadsheet, glued together and one broken link from failing silently. Here's what replaces the whole thing.
You don't need WordPress or a plugin to gate content. A standalone gated page with a built-in email form does the same job with no installs, no conflicts, and no PHP.