At the moment you would need to install a PDF printer, they are free to download with the best being cutepdf, which you can find here: http://www.cutepdf.com/
This will allow you to convert the file allowing you to email it in PDF form.
Windows 10 Users:
You should be able to use Microsoft Print to PDF.
There's an article on how to get the function back if you can't see it here https://www.digitaltrends.com/computing/print-pdf-windows/
Please Note: We are looking at changing this in a future release.