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3D Photoshop Layers in Motion
When you bring a Photoshop file into Motion and add a 3D camera, you will probably want to move your layers back in 3D space. If you drag on the HUD for the active camera your layers will appear to get smaller as they move back. To move and scale them at the same time, hold down the Cmd key as you drag in the HUD.

Cmd + Drag on the First Thumbnail Chip
It may help to set your viewport to show a 2-up display, with the active camera and a perspective view.
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