Android : free up space?


I have 5.1 Android.

I attached two screenshots.
-the internal storage has 285 MB free space
-the usb storage has 6.98 GB free space
-the Sd card has 21.59 GB free space

However, I can not even install an app with size as small as 6.05 MB because it says that I need to free 20.38 MB space!

Am I missing something or is the system buggy?
What should I do?

Thank you very much!
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dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Commented:
Have a read of this article and see how Android calculates free space

It will also explain how to free up space and that might solve the problem for you.

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Jackie ManIT ManagerCommented:
It is not buggy.

What is the brand and model of your phone?

You need to backup your data and do a factory reset.
Member_2_7965240Author Commented:

I have CUBE T8 Plus 8"
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