Wix Websites - Allowing Indexing of PDFs

I just learned this – uploaded pdfs are not indexed automatically on Wix websites!

To activate indexing on a PDF, the only way I've found is to link to a PDF from a button, image or text link in the classic Wix editor. See this link in the screenshot below, it says: "Show this PDF in search results" link in the link editor box.

I'm not sure if there is any other way to do this without adding a button or other link to it in the main page editor (a text/image/button link in the classic editor). This option doesn't appear when adding PDF links to a blog post, for example. I wonder if this setting isavailable elsewhere like in the Media Manager, I didn't see it as an option.