Save copy of pdf export to server

Is there a way to save a copy of the PDF export to the server?

I have read that the proxyURL parameter will only be called if the browser doesn't support saving files locally. Is there no way to get the export functionality to post the generated file to the server?

I'm trying to get a copy of the exported pdf to attach to an email that will be sent out.

Any insight into this would be helpful.

 Thanks!