Why my iphone 5a says storage is almost full why I've almost nothing?

So my iphone 5s says my storage is almost full while pictures is about 800!
And I've no music no books and no big apps!
This happened before And I tried deleting all pictures and most of the apps but nothing changed! So I had to format & update my phone then it worked… Now it happened again I can't delete my stuff because it's ridiculous! Why do I have to do this while my phone isn't really full:"(
Now I have only 251 MB available:"

So check it and see what's using the space.

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