I have a animation containing the layers of the back of a book and a page (with front side and back side grouped) that flips from the right to the left. I want to know if it is possible to halfway during the animation, insert a keyframe on the page (motion tween) to make it seem that it folds a little bit due to gravity. In other words it would resemble the effect the Warped Text > Flag function has in Photoshop?