Apple Motion 5.1.1 - Manual (Page 264)

Chapter 8 Timeline 264
The frames of the new layer replace the frames of the original layer. If the original layer
contained more frames than the new one, the old layer is split into two layers and the additional
frames remain.
Add an object using Exchange edit
The Exchange drop menu option is a variant of the Overwrite option, but instead of dropping
the entire duration of the new layer into the project, the duration of the existing layer is used. For
example, if you drag a 30-second clip over a 5-second clip, choosing Exchange swaps the existing
5 seconds with the first 5 seconds of the longer clip. If you exchange a longer clip with a shorter
one—for example, swapping a 10-second clip with one that lasts only 5 seconds—the first 5
seconds are replaced, and the final 5 seconds of the original remain.
The exchange edit transfers any filters, behaviors, and keyframes from the original layer onto the
new layer.
Note: You cannot use Exchange with audio files.
Exchange a layer
1 Drag an item from the File Browser, Library, or Media list into the Timeline track area.
As you drag, a tooltip appears, indicating the frame number where you are located.
2 Drag to the frame where you want the new layer to start, holding down the mouse button until
the drop menu appears.
3 Choose Exchange from the drop menu.
The old layer is replaced by the new layer.
67% resize factor