Can't see my .obj done with PS once imported in Dimensions

Hello to everyone.

I'm not a 3D designer. Just an illustrator learning 3D basics. I made this 3D model with PS, exported with “Export 3D Layer > File Format: Wavefront/OBJ”. In the Finder preview seems fine (fig.1)

But once imported in Dimensions I can't see it (fig.2). The file name appears in the Environment panel, the object position is written as if it's really in there but I can't see it.

What am I doing wrong? Can anyone help me please? Thank you!