Common uploads folder behing duplicated to backend assets

Hello, I’m having a issue that is described mostly on the title.
The problem is this even if I delete the backend/assets content when I log into backend url it recreates all 3Gb of data from common\uploads.
Anyone with this problem?

That means you have uploads used in an asset. Remove such usage and it will stop.

Is there a specific file where I can check that?

It is an asset class. Which one and where it is depends on your project.