You can create a link in any Web Page or Newsletter Message and upload a PDF or other document file type using the Insert Link toolbar button
on the WYSIWYG editor toolbar. If you highlight or create and highlight your Link Text beforehand it will be made into your new link.
The Insert Link toolbar button
loads the Link Properties form or dialogue box:
from there you can use the Browse Server button to link to an existing file, or use the "Upload" tab on the form pictured above to browse your desktop for a file and upload that to the server. This action automatically creates the link, and once the file upload is complete, pressing the "OK" button will complete your upload and link creation.