Perhaps you can help as I am elderly and new to smartphones!

I have NHS app on my phone and from tyhis I can bring up a QR code for my wife and my Covid jabs - they appear as two separate QR codes for each of us I know I can download them and get a hard copy from my laptop before we go to the airport and I will do this -  but I can also make them stay on my camera somewhere say in a file or gallery so that I can easily find them to show at the airport?

At the moment when I get mine I the have to lose them and get my wife's - can I store them together? 

In simple terms please. Thanks

Moggie