Cards are not milling. For instance, when Lumra is played, cards will not mill, though the function returns cards from the graveyard to the battlefield. Same with Ainok Wayfarer and Quag Feast--playing the card does not cause cards to mill. Attached files show cards on battlefield but not in graveyard (all in graveyard put there because they were destroyed in combat or played (instants/sorceries/enchantments).
Best regards
JM