When you create a background for animation, a still image might remain the same for several frames. Adding a span of new frames (not keyframes) to a layer extends the contents of the last keyframe in all the new frames.
Select a frame to the right, marking the end of the span of frames to add and select Insert > Timeline > Frame.
Alt‑drag (Windows) or Option-drag (Macintosh) the keyframe to the right. This creates a span of new frames with a keyframe at the end point.
Comments
Comments are no longer accepted for Flash CS3. Flash CS4 is the current version. To discuss Flash CS3, please use the Adobe forum.