Apple Motion 4 - Manual (Page 243)

Adding Media to Your Project
Once you’ve created a new project, the next step is to add media files to your composition.
All media types—movie clips, still images, audio files, or other objects appearing in the
Motion Library—are added to your project using the same methods.
Note: Layered Photoshop files have additional import options available from the drop
menu. For more information, see
Adding Layered Photoshop Files to a Project .
The Link Between Motion Layers and Media Files
Prior to learning how to add media to your Motion project, it’s important to understand
the correspondence between layers and source media. Every time you add a file to your
project, you create a link between the layer you see in the Canvas and its corresponding
media file on disk.
Motion is a nondestructive application. This means that any changes you make to media
objects in a Motion project aren’t actually applied to the media files to which they’re
linked.
Because of this link, whenever you add a file to your project, you need to make sure it
remains available on your hard disk for as long as you’re working on that project. If you
move, delete, or rename media files that correspond to layers in a Motion project, those
objects become “offline.” Offline layers appear as checkered rectangles that occupy the
entire bounding box of the object.
If this happens, it’s easy to reconnect the offline layers in your project with new copies
of the media you lost, assuming those files are still available. For more information, see
Online Versus Offline Media .
Selecting Files in the File Browser
You can add files to a project using either the File Browser or the Import command in
the File menu. In most cases, the File Browser is more convenient, and gives you more
control over how the resulting objects appear in your project.
243 Chapter 6 Creating and Managing Projects