You can upload the files directly to your declaration. To help you with that process, you can follow this step-by-step guide.
There are instructions for iPhones, Android phones, Windows and Mac computers. Follow the instructions for the type of device you are using.
In each case, the first step is to download your COVID-19 vaccination certificate and pre-departure test result to your device, so that you can then upload them to your New Zealand Traveller Declaration when you’re ready.