Yes. I know this. But I can’t open the file that was uploaded by seller as a downloadable product. It gives me the error that I’ve been trying to explain.

Thank you for your answer!

As an admin of the site I want check everything that gets uploaded and submitted to my marketplace. I would first like to verify the quality of the downloadable product before allowing it to go on sale and for the public to buy it.

So when a new product is submitted, I go to the WooCommerce Products page, where I select the one I would like to approve. All products will be downloadable, I go and check the URL that WordPress gives, where my seller has uploaded his item. When I try opening that link it gives me a 403 forbidden error.
The same thing happens if I go to my Media within the WP Dashboard and try opening the uploaded item through there.

How could I easily inspect these items before publishing them?

Thank you!