Email submit include PDF and XML

I've found multiple topics on how to change a form's submit button to submit a PDF, instead of an XML file.

What I'd really like to do is submit both a PDF and XML file. Is this possible in any way?

I've tried to modify the xml code so that there are two submit actions, like this:

event activity="click" name="event__click"
submit textEncoding="UTF-16" xdpContent="pdf datasets xfdf" target="mail to:email [at] domain [dot] ca" embedPDF="1" format="pdf"/
submit format="xml" textEncoding="UTF-8" target="mail to:email [at] domain [dot] ca"/
/event

But it only uses the first action.

Any ideas?