Extending still images

When creating a background for animation, it's often necessary to make a still image span several frames. Adding new frames (not keyframes) to a layer duplicates the contents of the last keyframe in all the new frames.

To extend a still image through multiple frames:

1 Create an image in the first keyframe of the sequence.
2 Select a frame as many frames to the right as you want to add.
3 Choose Insert > Frame.

To use a shortcut to extend still images:

1 Create an image in the first keyframe.
2 Control-drag (Windows) or Command-drag (Macintosh) the frame to the right for as many frames as you need. Each time you drag to the right, a keyframe is added at the end of the new frames.