To include a downloadable PDF invoice in your order confirmation you must add the Sufio PDF invoice component in the UpOrder template builder.

The component only works if you have the Sufio app installed. If you do not have it installed, when you try to use the component you will be prompted to install the Sufio app.
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Once the app is installed and the PDF invoice component is on your template, your customers will be able to download a PDF invoice for their order. 

To make these changes effective, make sure you set the email templates live into Shopify again!

Please reach out to [email protected] or through the in-app chat if you have any questions!