Q:  For email campaigns, I would like to attach a pdf file to email to send to all invitee or attendees, how do I do that? 


A: There are 2 options:


1. If you send from Invitee or Attendee Grid, you can click on Attach file:


2. If you send from Campaign, you can Attach the file through the feature "Attachment" 


You can attach multiple files as well, but total attachment size should be less than 10MB.