Object layer opacity

Try to avoid animating object layer opacity and animate object opacity instead. Object layer opacity controls how each layer of a multilayer object blends with other layers, whereas object opacity applies to an entire object. LiveMotion has to generate new artwork when you animate the object layer opacity. When you change the object opacity, however, it's handled natively in the Flash player.

You can change the object layer opacity to make artwork appear and disappear in different custom states (this is useful for creating remote rollovers, for example). However, it's more efficient to group the artwork and create the custom states at the group level, since this lets you vary the object opacity of the grouped artwork, and LiveMotion would export just a single copy. As an alternative to grouping, you could turn off all object layers in rollover states where you want the artwork hidden. When all layers are hidden, LiveMotion exports just a blank placeholder.