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Tracyheywood , that is not possible at the moment - You could add a logo to an exported panorama (image file) using something like photoshop for example, and then use a viewer as we discussed here, but this feature is not yet available natively.
If the viewer Enscape uses doesn’t support static viewport overlays then you could always subtlety build your logo into the model. You could have it on the licence plates of cars, in street signs, shop signs. For interiors you could do books, magazines/brochures, tv’s, you could even wrap it on to a mug or water bottle.