What's the problem with Honor?

Question

Android

Before each update, the memory is clogged (I am partly to blame), but after the update, about 2 gigabytes are freed up for me. What is under these 2 gigs and if possible, how to clear them yourself?
I would be very grateful if you answer
Honor 7A pro

Answer 1

The archive with the update is first downloaded, taking just 2 G.
Then it is unpacked where necessary.
And the original archive is deleted in the update.
Everything happens automatically.