The feature wherein we may be able to see what invoices have been printed is still not integrated with our web version software, however what we can do is to request for it to be integrated.
The option to track whether an invoice has been downloaded or printed after sending it through your customer's email has been suggested, but no specific timeline has been provided for its implementation. In the meantime, please feel free to reach out again if you have any more questions, and we'll be glad to assist you.