Unable to Import: FBX model breaks apart and zipped OBJ won't open at all

So a bit baffled here. Trying to import a character into Mixamo. A plain/no texture OBJ works fine - but the zipped version with MTL won't import at all. And the FBX version breaks appart the model on import (e.g. head is detacted from next). 

This page isn't presently unable to upload OBJ and FBX files either 🙂 

Quite frustrating . . . any help/leads greatly appreciated!!!