Hi -
I'd use SubmitToSharePointList - that way you can create (or update) a list item and add the file as an attachment. This document, while kind of long, has information on including attachments with your list item.
If you are saving your docs to a library using SaveToSharePoint - this can be done (also with SubmitToSharePoint) but it is a little more complex, and the approach I'd recommend would depend on the version of SharePoint you are working with.