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About layers in animation

Each scene in a Flash document can consist of any number of layers. As you animate, you use layers and layer folders to organize the components of an animation sequence and to separate animated objects so they don't erase, connect, or segment each other. If you want Flash to tween the movement of more than one group or symbol at once, each must be on a separate layer. Typically, the background layer contains static artwork, and each additional layer contains one separate animated object.

When a document has several layers, tracking and editing the objects on one or two of them can be difficult. This task is easier if you work with the contents of one layer at a time. Layer folders help you organize layers into manageable groups that you can expand and collapse to view only the layers relevant to your current task. See Using layers.