Whenever you send an invoice, it could happen that your customer requests an original copy of the invoice. To access the original version, simply navigate to the invoice in question and click on the three dots at the top of your screen. In the menu that appears, select Print original invoice.
The original invoice will then be downloaded and can be printed and/or sent.
Note: If a reminder was already sent, the original invoice will be overwritten by the invoice sent alongside the reminder. If you still want to access the original invoice, you can go to Files > History and download the desired version.