3mf and stl not importing correctly

While waiting for my printer to arrive I started using Studio. Created a simple file using freecad and exported in the formats above. When imported to studio it is just a rectangle, no cutouts & it tells me there are 16 objects.
Tried importing to Studio first and went to cura when the import failed.

Same file imports to cura and formats correctly on the ender printer.

Resolved by removal of Studio, computer off for a while and a new Studio download, clean install.