My architecture is MVVM. For implementing paging I used paging library from architecture component. I need paging for outer recycler view and inner recycler view. For outer recycler view I successfully implemented it, but for inner recycler view I don’t know how to implement. I implemented paging like in this article for outer recycler view
https://proandroiddev.com/8-steps-to-implement-paging-library-in-android-d02500f7fffe
UPDATE
I implemetened my inner recycler view like this example and it works, but I think it's not preferable solution how to use paging when recyclerview item have another recyclerview