ipad design review not allowing passing through of walls, cant walk into rooms, essentially keeps on zooming in on walls

hi, i am exporting .dwf and .dwfx files from revit models, uploading to cloud, then opening on design review mobile on ipad, i am unable top pass through walls on the ipad, essentially just keeps on zooming on on the wall, the sample project provided with design review mobile allows the passing through of walls, how do i enable this functionality? thanks
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