It says that the APFS (Apple File System) is the default file system on iOS, but I just want to confirm that all Apple provided apps such as Photos, Notes, Keynote, Mail, use it also.
(hope this question isnt as ****** as it sounds, I guess I’m always a bit uncertain with Apple provided stuff as they have secret privileges)
The exact layout of the iOS file system is an implementation detail. It’s changed in the past (from HFS Plus to APFS, and multiple more subtle changes within APFS [1]) and it may change again in the future. You’re free to explore that implementation yourself, of course, but I strongly recommend that you not encode such implementation details into your code.
Having said that, my understanding is that iOS currently uses APFS for everything.
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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[1] For example, the one described in File system changes introduced in iOS 17.