This shows the various user-created layers containing the media. Note that layers higher up the screen obscure those below them (Layer 1 in this example would obscure Layer 7 after the transparent fade and where there is active content on Layer 7).
You can edit properties on a resource by double clicking it, or right click and select Properties from the menu.
Hovering the mouse over the resource will give further information on it:
A resource position and length on the timeline can be altered by dragging it in the middle or either end.