NotifyDataSetChanged method does not refresh my RecyclerView Kotlin

 downloadList = list

because of this line it is not same reference to download list anymore

try

private fun observers() {
    downloadViewModel.getDownloadList().observe(this, Observer { list ->
      with(downloadList){
    clear()
    addAll(list)
}
        downloadList?.let {
            downloadAdapter.notifyDataSetChanged()
            }
        })
}