Apple Motion 5.1.1 - Manual (Page 262)

Chapter 8 Timeline 262
Add an object using Insert edit
When you choose Insert from the drop menu, Motion leaves the existing layer in its track, but
pushes it forward in time to make room for the new layer. For example, if you insert a 100-frame
movie into a group containing an existing layer, the new movie is added to the Timeline at the
frame where you drop it, pushing the remaining frames of the original movie out 100 frames.
After Insert edit
Before
If you insert a new item midway through an existing layer, the existing layer is split into two
layers, each on its own track.
Insert a layer
1 Drag an item from the File Browser, Library, or Media list over an existing layer in the Timeline
track area.
As you drag, a tooltip appears at the pointer, 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 Insert from the drop menu.
The new layer is inserted into the track, breaking the original bar into two, and pushing the
frames after the insertion further out in time.
67% resize factor