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iPhone 16 Rumored to Feature New 'Capture' Button
(www.techtimes.com)
This is a most excellent place for technology news and articles.
I just checked and it works as a shutter button for me. Seems like it works as a shutter button only if you have it set to open the camera - if you don’t, whatever action it’s set to seems to take priority
Also the volume buttons trigger the shutter, so seems a little redundant for all 3 buttons to do the same thing