Can I add documents from a SharePoint-location?

Yes, you can easily add documents from a SharePoint-location

When you add a meeting document from a SharePoint location, the attachment is copied to the meeting and is also converted to PDF. In this way participants can make annotations during the meeting.
Add from SharePoint


Organizer - Add attachments



Information: The source file of your meeting document remains unchanged at the SharePoint location. If you want to make substantive adjustments to the document, you have to do that in the source file. You can then publish the new version of the meeting document. The old versions will be retained because of version control.