I had problems with saving images among other things on iOS 15 and updating fixed my issues.
I know some people can’t due to a desire to jailbreak and whatnot, but I felt like making this more known.
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I (mainly) had battery issues, I got this iPhone 7+ jailbroken and installed rootless powercuff. If you got an iPhone 6s - X then you can jailbreak in (almost) every newer iOS version with palera1n (ios.cfw.guide is a good place to start).