On my XR, software version 14.7.1 storage reported as being used in Iphone Storage, exceeds the total of all the apps and date being used by them. I added them up twice to make sure (after offloading every apps data), I was throughal. This hasnt always been an issues, just with more recent IOS updates.
I phoned and talked to the advanced D&D team at Apple twice and they could not figure it out. Telling me all was good, like I was kind of imagining things.
I record alot of educational videos, some videos quite large... after downloading from Icloud to my computer, I delete them, and of course delete all 'recently deleted'. I believe after some time this data is getting corrupted on deletion, and still remains taking up 'app' space. This is a big problem apples programmers need to fix ASAP.
The only fix I found was to erase my iphone and restore (a mirror) from a recent backup. Using restore (from backup) in Itunes... the problem is solved. But with all my apps and data back on - a replica of when I was having Iphone Storage reporting in excess (isnt this odd).
The result after restore is now only 22.4 GB being used, as opposed to the 50 GB before. Apple please find a fix for this, thank you.
'What the h would one do if they didnt have a computer with Itunes, just the phone?'