Some posts have as only content a related PDF, so it's impossible to access from single

In the current web there are CPT that have as only content a PDF (in a custom field). So we have to find a way to display that PDF when viewing a single Document, for example.

Solutions:

• A. display a download button
• B. embed the PDF in the single view

It happens in different posts and CPT, indicated in the "comments" column at https://docs.google.com/spreadsheets/d/16v0He3b9sD3PcXz_OW7C4vix3Pq1XOqr-jBbKScZ_LA/edit#gid=1582349209