Most row/column grid slides can have level 2 topic images configured with 'rollover' where a preview of the explanation is shown.
In the output, hover over the image to show the preview and then click the arrow to see the full explanation.
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Create a grid slide.
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Create a level 2 topic based on the Preview Child CH template.
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Insert the file object that should show on top of the preview item.
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Add any text below the file object if needed. This text is dipslayed below the rollover image, when you hoover over the rollover image.
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Add a level 3 topic for the popup.