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I would suggest you set up an Autoresponder email with the PDF attachment. Here's a guide: Creating-a-Form-Autoresponder.
Here's how to enable the PDF attachment:
1. Click the "Emails" button in the toolbar.
2. Select the Autoresponder and then click the "Edit" button.
3. Go to the "Advanced" tab and turn on the "PDF attachment".
Hope that helps. Thank you.