The only instructions are in the description you see when you choose the Mail w Attachments module in the channel preferences.
Note that you must use the SENDEMAIL command if you want to send an attachment. It’s options parameter was open ended enough for me to add another option. The path used with the Attachment= option needs to be a complete colon separated path, starting with the volume name.
If you are also making the pdf with a procedure, you will need to use the PDFSETUP custom statement. This wasn’t written by Provue either, so it’s not in the Panorama Reference wizard, but you can find it documented in the Custom Statements wizard.