Change default photo name in iPhone
in my family we have 3 iPhones and most of take photos through iPhone. While storing them in the same folder the default names getting duplicated. Many forums highlighted that it is not possible to change it.
In the next release of iOS, request Apple engineers to give an option for photo convention say yyyymmdd_<usertext>_RunningNumber.
User text can be restricted to 3 to 5 text or numeric.
iPhone 6s, iOS 10.2, null