Hi Jakub!
As Brenden briefly mentioned even with version 8, you'd probably need to do some customizations. The 'alerts' are currently not built-into Kentico, but hooking up to a global event that's fired when a new file is created and doing what's necessary for the 'alert' to appear should do the trick.
If you're not sure how you can add functionality or create a new module extending Kentico's functions, don't worry. It's all in the documentation.