PDF attachments are not being sent with notifications on form submission

Question:
I created forms for my client and checked the “attach submission as a pdf” box. The only problem is that it doesn’t work consistently. There are over 40 submissions to the form, but only about 10 of the emails have pdf’s attached to the notification email. Does anyone know anything about this…or where I can escalate it as a support ticket? I’ve been through all the forums and can’t seem to find a solution. Alternatively, having access to a pdf of the original submission could be a good workaround, but I can only export them as a csv file?

Product:
Wix Editor

What are you trying to achieve:
I need to be able to access pdf copies of individual submissions. Since they have signatures, we need to be able to print up the “permission slips.”

What have you already tried:
I’ve been through all the forums Facebook groups and can’t seem to find a solution

Additional information:
How can I escalate this and find a solution?