Container field, Exporting Field Contents, and File Paths

I've got a simple web direct form that has one container on it for the user to attach a file to.  Part of the form submission process is to export the field contents of the container so that it can be sent out as an attachment for an email.

I'm using the excellent BaseElements plugin to handle exporting of the field contents with WD.  With all the the get (Xpath) functions not working with WD, I've got to be able to tell it to save the file to SOMEwhere.  Are there any alternatives, including plugins that would help me with this?  

Otherwise, I could trigger this functionality as a Server-sided script or even use CWP/PHP to handle this.  But I was hoping to make this workable all in one submission, rather than breaking up the tasks.

Thanks!