Cannot get slide layers to appear

Embarrassed to be asking this as I think I must be doing something fundamentally wrong.  I have created a slide layer with text and an image.  The layer is on the timeline and shows when I play the slide from the play button by the timeline.  No matter what I do i cant get the layer to appear when the project is previewed or published.   I have tried getting the layer to appear using a trigger, when the timeline starts, in response to a user click and nothing seems to be working.  Any ideas very much appreciated. Thanks

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