...
Find the PDF link
Content > Media
Search for the name of the file. It should be the official title of the document.
Click on the Edit button.
Right-click on the PDF link and copy it.
Add the PDF link to the page
Go to the page you want to add the file to.
Click the Edit tab at the top.
Find the place where the PDF link should go.
Paste the URL from the PDF into the text or button.
Save as Published page.