When you create a layer or folder, it appears above the selected layer. The newly added layer becomes the active layer.
Create a layer
Do one of the following:
Click
the Insert Layer button
at
the bottom of the Timeline.
Select Insert > Timeline > Layer.
Right-click (Windows) or Control-click (Macintosh) a layer name in the Timeline and select Insert Layer from the context menu.
Create a layer folder
Do one of the following:
Select a layer or folder in the Timeline and select Insert > Timeline > Layer Folder.
Right-click (Windows) or Control-click (Macintosh) a layer name in the Timeline and select Insert Folder from the context menu. The new folder appears above the layer or folder you selected.