By default the pdfs designed for each form are automatically attached to all the emails that the form send but in the full version you can configure which emails should have which pdfs.
To configure which emails will have a pdf do the following:
1.-Create an email in the form builder that you are using
Go to settings and click in confirmations
Click in settings and then in confirmations
Click in email and actions
2.- Go to you pdf template and click in template settings
3.- Select in which emails your pdf is going to be attached