I'm using a motorola E2 (2015) with android 6.0

My problem is that I cant figure out whats taking all my internal storage space.




It says 4 gbs used, but if you sum 2,72 gb + 30 mb from images and 183 mb from "others" it's 2.975 gb
NOT 4 GB. So where is the missing GB if android already takes 3gb from the total 8gb of my device