Why does my iphone say I have used so much storage?

It say I have used 5.3 GB. It say I have 821mb left. I added up all the apps and and its like 3300 MB. I looked it up and its like 1000 MB in a GB. So that's like 2 GB that's being used that isn't there. What is taking up all my storage. Can someone please explain?!

Added (1). And can someone tell me how to free up some storage if I can

Loads of stuff! Files that are cached, or downloaded, the phones operating system, and much much more!

The caches and stuff on my phone with 32GB take up about 5GB of it's space!

I think you should get more data next time.

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