To create a copy of the receipt, you can either do this from the register view, or go into Order Details Page in the upper right corner of the POS.
To create a receipt copy from the order details page:
Select the relevant order.
Click on the "Print Receipt" button.
A receipt modal will open where you can choose if you would like to print a receipt copy by sending it to the Receipt Printer or send it over SMS or E-mail.
To print a receipt copy from the register view:
Press the "Print" button in the default register view:
A receipt modal will open, here you can choose to either print the receipt copy, or send it over SMS or E-mail.
Pictures:
Receipt SMS