File upload

I’m putting together a relatively simple online print store using the Sofa Suppastore theme.

Through the email checkout, I need to add a file upload option as the theme doesn’t come with one as standard. I thought to use Contact Form 7’s file upload feature but my issue is that I need a single button to submit both the file itself and the information from the standard form. Currently, there are two buttons to submit each separately.

To see what I’ve done please visit: https://www.damienlees.com/ucprint
– then select one of the business cards
– run through the checkout system and select a shipping option
– click the “Order by Email” button

You’ll then see that there is a form
with the “File Upload” who’s code I grabbed from Contact Form 7 and pasted into the “mail_order” php template.
In this screen, I would like remove the “Send” button and make the “Place My Order” button submit both the form information and the file.

Assistance would be greatly appreciated by this novice. Let me know if you require further information or any code.