There is no constitutional urey to provide articles of impeachment. They impeached. That is indisputable because we all saw it. The Senate has sole power now.
I believe they are required to formally present the Articles of Impeachment to the Senate for review, and the trial.
It would seem they would have to document their process that lead to their conclusion, Impeaching Trump.
If they can’t do that, this process drops doesn’t it?
Nancy has balked at providing them, so she has confirmed that she is expected to.