Hi Jason,
If you'd like to submit a form with attachments to sharepoint all you would have to do is create a form with a File Attachment object and submit button.
Then Add a Data Connection that Submits Data. Select the To a Document library on a SharePoint Site option. Enter the Path for your SharePoint Library in the Document Library Field (e.g http://au.formsboard.com/MyDesiredLibrary)
Then add an action Rule to your submit button that Submits Data. Select the Data Connection that you created to your SharePoint Library and that's pretty much it. After adding an attachment and clicking the submit button the form data should be saved in your sharepoint library.
Hope that helps,