In the pre-smartphone days, if you wanted someone to take a picture of you in front of the Eiffel Tower or something, you first had to give them a little impromptu lesson on using your camera. An ambitious new iPhone update reported by Bloomberg’s Mark Gurman , but not yet confirmed by Apple, sounds like it would make the default camera app so customizable, it could bring that kind of befuddlement back to smartphone photography—but only if the phone’s owner chooses to set it up that way. Gurman, whose reporting comes as always from anonymous sources, writes that the impending updates, “should appeal to professional users.” The physical side button that brought up camera controls starting with the iPhone 16 invited users to get adventurous with the device’s more advanced features, and this app seems like the next step for the users who actually like that button.…