I have a model that is made up of lots objects that I already named to to bake in groups for Marmoset. I tested if Rizom takes that as a obj and exports it back as the separate objects which worked fine. It also worked fine after I edited some of the UV. When I had then the final UV and I tried to export it everything was suddenly merged, to a object namend Default. Furthermore there was a error in it Unknown Command/Invalid Vertex Index. wavefront object importer was able to import it never the less, gw obj importer not. FBX export has everything merged as well. The official FBX converter can not convert your FBX by the way, it says not enough parameters.
It would also be much appreciated if there is any way inside Rizom to see objects and maybe select objects. The saving being the same as export is also confusing. Maybe I messed things up trying FBX inbetween which then merged everything?