Tinkercad Direct Export (Recommended)
Outline
How to Export to Polar Cloud
"Tinker" and Design Your Object
Click "Export"
Click "3D Print"
Click "Polar Cloud"
That's it!
Your import will open up in a new tab, and the object will be imported.
If you want to make changes to the object, head back to Tinkercad, make the changes, and RE-IMPORT it.