When taking a photo on an iphone do I need to keep finger on button for flash to work?

When taking a photo on an iphone do I need to keep finger on button for flash to work? - 1

Added (1). People asked me to take their pic but the flash did not work they blamed me for taking it wrong. I pressed the button until a square came up and I let go. Should I have pressed down for a few seconds?

Added (2). I think the flash WAS turned on but I did not press long enough?

Ok you are a noob I can see that but I will help you out… On the upper left corner of the camera app there's a flash icon if you touch it you can change it to auto, on or off

No.
If on Auto it would apply a flash if it is deemed too dark.
If on On then of course it would go off regardless.

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