A motion tween requires a symbol instance on the Stage and its own layer, which is called a tween layer. No other tween or drawing object can exist on the tween layer.
A motion tween creates between different keyframes smooth transitions of an object’s location, scale, rotation, transparency, brightness, tint, filter values, or 3D rotation or translation.
A keyframe marks a change in one or more properties of an object. Keyframes are specific to each property, so a motion tween can have keyframes for position that are different from keyframes for transparency.
To edit the path of an object’s motion, choose the Selection tool and drag directly on the path to bend it. You can also choose the Convert Anchor Point tool and Subselection tool to pull out handles at the anchor points. The handles control the curvature of the path.
Easing changes the rate of change in a motion tween. Without easing, a motion tween proceeds linearly, where the same amount of change happens over time. An ease-in makes an object begin its animation slowly, and an ease-out makes an object end its animation slowly.