i can't find files that are taking up space

I have bought Lenovo k4 note n have recently upgraded to marshmallow. So I ve 16 GB of internal memory out of which the Android 6.0 inbuilt memory app inside storage and USB setting, says 5.37 GB is OS occupied. 9.46 GB out of 10.63 GB is used. Further break down are as follows:
Apps 5.29 GB
Images 105 MB
Videos 8 KB
Audio 588 KB
Other 488 MB
Cached Data 183 MB
Which totals to 6.066 GB. So now subtracting 9.46 with 6.066 GB I get 3.394 GB which I can't understand where it went.
Still after going inside file manager n clicking the view hidden files these are what I get:
Android 2.17 GB
Download 278.01 MB
Shareit 200 MB
WhatsApp 136 MB
Pictures 74 MB
Books 52 MB
Which comes to around 3 something GB and still 3 GB are missing.. so.. around 6 GB of files are not showing.. I am unable to find the files that are taking up space. Can anyone help please.

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