Hi I tried to import a 3mf file that I had saved, but nothing is in the working space. Is it possible to import my 3mf file so I can work with it further ?
3MF or STL formats are not editable models. You can only modify them by subtracting portions of them or adding objects. They are not direct modeling entities.
McD
Nevermind I figured it out 
I had to first convert the 3mf file to STL format using a 3rd party free online converter, then the import of the STL worked perfectly