Check the Field Map Layout and make sure the email action is checked.
From WP Dashboard | PRO2PDF | EXPORT | Select Field Map | Check “Attach file to Email notifications=YES” and check the FF email action is also selected.
If all is correct, try creating a test Formidable Form and Field Map Layout. We are checking if the issue is only with old forms or with new forms too.
Let us know the results.
We remain at your service.