I had an operation on the palm of my right hand recently and cannot use it for a while.
I know that I can ask 'Siri' to open the camera app and set it to take photos, but she refuses to press the shutter.
Holding the phone in one hand and trying to hit the shutter button with a finger of the same hand is a bit too much for my old clumsy digits.
So I've found a workaround.
Settings >Accessibility >Voice Control >ON
Open Camera app, point and give the voice command, "Turn volume up" or "Turn volume down"
This activates the volume control and because the Camera app is active, it takes the photo!

I know that I can ask 'Siri' to open the camera app and set it to take photos, but she refuses to press the shutter.
Holding the phone in one hand and trying to hit the shutter button with a finger of the same hand is a bit too much for my old clumsy digits.
So I've found a workaround.
Settings >Accessibility >Voice Control >ON
Open Camera app, point and give the voice command, "Turn volume up" or "Turn volume down"
This activates the volume control and because the Camera app is active, it takes the photo!