What, exactly, is SketchUp's definition of a "solid", and why is a simple cube shape not considered to be one?

This is actually meant for importing into a video game engine. Which, now that I’ve been banging away at it for a while, doesn’t seem like the kind of 3D modelling SketchUp was designed for (considering I need to deal with UV mapping, and that doesn’t seem to be an available function in SketchUp without a plugin)

But hey, at least I got it into the engine in one piece now:

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