Open the page where the attachment should be linked:
Select the text to link:
Click the “Add Media” button.
Click “Upload Files” or “Media Library”:
(Upload the file if it is not already uploaded)
Click the icon for the file.
Then replace the Title text with the text for the link.
Choose “Media File”
Then click “Insert into page”
You will need to format the link text again (bold, text color, etc).
Select the link text. Then click the “Link” icon (it looks like a link of a chain).
Check the box for “Open link in a new window/tab” then click “Update.”
Remember to PUBLISH the page to see your changes!