Undo option for masks on mobile

While brushing or selecting a mask, even with AI assisted masks, you can make the wrong selection. Undoing the last action would be incredibly useful: as it is with brushing for example, if I add the wrong brush stroke I only have two options: to try to erase that stroke with an erase brush if the stroke is not overlapping previous strokes, or start over the whole mask. This makes it cumbersome.