All These Cameras Photographing Cameras...
I don't even have a smartphone, but wouldn't they have native and app Screen Capture utilities, like Spectacle on Linux, or KSnaphot, anyway ?
No need to photo anything.
Obviously other OSs have snapshooting: crude as it may be for Apple:
On macOS, a user can take a screenshot of an entire screen by pressing ⌘ Cmd+⇧ Shift+3, or of a chosen area of the screen by ⌘ Cmd+⇧ Shift+4. This screenshot is saved to the user's desktop, with one PNG file per attached monitor