By default, a "Show layer" trigger will not replay a layer that's already displayed. To get a "Show layer" trigger to replay a layer that's already displayed, make the following change to that layer's properties:
- In Storyline, select the layer in the Slide Layers panel in the lower right corner of the screen.
- Click the gear icon (the Properties button) for that layer.
- Mark the “Hide slide layer when timeline finishes” box.
- Click OK.