So this is my second upload attempt. I am not quite sure how the import-filter here works. I may have to download the Blender-Plugin and test that. I only have a dated version of Blender. For every model -- it seems -- I have to download half a gig. Anyway, please download this model: https://sketchfab.com/3d-models/flying-wing-with-tricycle-gear-7c8e42f75cca44e1b154ad4204d9b295