add file to sales quotation email

Hi,

For a customer, we need to send by mail a sales quotation (PDF file) with an other document like sales condition (PDF file too).

It is ok to send by mail the sales quotation (PDf file) but how to add an other document ?

On event action, we found this but how it works ?

Customer use : 21R2 Managed Cloud

Regards,

Christophe