As julienK says, it can be many (many, many) things not being set up properly...
The view you selected is a generic perspective. It is entirely possible that your model is not within the view of the perspective virtual "camera". Rather than walk you through navigating that, instead open the 3D viewpoint called Generic Axonometry in your project map. Then do a zoom extents (cmd-' or ctrl-' [single quote] - or menu command) if necessary to zoom into any 3D elements.
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