How to explore an iPhone file store?

I can't see any equivalent of Android's Settings/Storage to see how full the iPhone is, or any way to get the photo gallery to show a list of jpgs and sizes/resolutions.
(I can't see any way of exporting jpgs either, but that's another question)

Settings > General > Usage > Manage Storage

That's giving me a 31 MB pictures folder, but I'm not seeing any individual files: how do I see indivual files?

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