In After Effects 12.1 and later, a new layer is placed directly above the currently selected layer in the Timeline panel; if no layer is selected, the layer appears at the top of the stack. In previous versions of After Effects, new layers always appeared at the top of the stack. The following text replaces the first step in the “Adding ambient light” section, which is on page 308 in the printed book.
1. Deselect all layers, and then choose Layer > New > Light.