@michaela_p I’d suggest to keep all paperwork with. I use Amazon Kindle for this kind of stuff (also used during COVID for my proof of being vaccinated). Any other E-ink device is also great. The reason is that for prescription etc. I want to keep them in a single place, which always has battery.
Full algorithm:
For redundancy I tend keep the scans also in the Notes app for the course of the travel. Papers get lost so this feels the most fail-safe approach (and best for your personal privacy).