How to maintain Activity package in Orchestrator



I want to know how to maintain activity package in Orchestrator.
Is there any document about this?
I think activity package (ex. UiPath.Excel.Activities etc.) exists robot machine, orchestrator machine, UiPath official website(MyGet feed) .
My understanding is, orchestrator should be central repository of activity package which distribute right version to each robot machine.
So I think maintenance of activity package in orchestrator is one of admin task.

I already refered here.

Best regards,