How do I make it so a PDF of the completed form attaches to submitted emails?

Now how do I make it so a PDF of the completed form attaches to
submitted emails

You can enable the PDF Attachment in the advance notification email settings. Here's how:

1. Open your form and go to the Settings section.
2. Select the Emails tab and click the Pen tool (Edit) of the notification email.

3. Go to the Advanced tab and enable the PDF Attachment feature.

Hope that helps. If you have questions, please let us know. Thank you.