[Zope] MailHost Question

I'm trying to set up a mail form that has file upload capabilities. I'm using the code below and it works, but one has to enter the filename manually to get it to show up by the attachment icon. Is there any way to have the file name automagically entered? <dtml-boundary type="application/octet-stream" disposition="attachment" encode="base64" filename_expr="doc_name"> <dtml-var expr="resume_file.read()"></dtml-mime> I know I can use filename_expr="resume_file.getId() if I'm using a document from Zope, but I would like an anonymous user to be able to use this as well. -- Michael Lewis