Opening STL Created in Fusion 360

Very newbie question:

I created an object in Fusion360, exported it as an STL, and then opened the STL in Luban. The object in Luban is WAY too small, but I can’t tell how big it really is so that I can enlarge it to the correct size. I would have thought that the two objects would have been the same size, and I could have just printed the exported STL. Am I missing something?

TIA

Inches to mm, scale by 2540%. Or change fusion to export in mm units.