First Impression Gallery

The First Impression Gallery includes all Gallery assets that Product Page Visitors see without scrolling through or interacting with the Gallery. The number of Gallery assets Visitor will see varies depending on Gallery Orientation. In a Portrait Gallery, the First Impression Gallery includes the first two Gallery assets (App Preview Videos /Screenshots). In a Landscape Gallery, the First Impression Gallery includes the first Gallery asset. In a Hybrid Gallery, the first two Portrait Gallery assets will be shown.

For more information on Gallery orientation, read this.