I'd also be wary of just using the photo app to take a photo of any potentially sensitive document. Do you have your phone set up to automatically back up photos into Google Drive or iCloud or Dropbox? Are you sure? I thought I didn't, but on setting up a new phone, I suddenly had access to a bunch of photos I took with a previous phone (and not the most recent one either, like 2 or 3 phones ago)

That doesn't mean they're shared publicly of course. And even if they are, maybe there's limited things people can do with just the information w/o having a physical copy.

Anyway, point being, there may be unintended consequences, of which everyone of course has to make their own decision about how paranoid they want to be.