You can exchange clips and sequences between Final Cut Pro and Motion. When using both on the same computer, they integrate so tightly that you can work with a Motion project in both applications at the same time, without having to worry about moving files between applications.
If a media file you used in a Motion project is moved to a different location on your hard disk, that element won't appear in the Motion clip that is embedded in your Final Cut Pro project.
Normally, when clips go offline in Final Cut Pro, you will get an Offline Files message when you open your project. Offline files in Final Cut Pro will display a red background with the text "Media Offline" when displayed in the Viewer or Canvas.
However, if an element in your Motion project has gone offline, you will see a red and white checkerboard pattern and will not get an Offline Clip warning in Final Cut Pro.
If this happens, open the Motion project (Control-click the Motion clip in your Final Cut Pro sequence and choose Open in Editor from the shortcut menu). Motion will prompt you to reconnect the missing media. After you reconnect, save the Motion project. When you switch back to Final Cut Pro, the clip will display correctly.