I am able to repeat this issue. I imported a hi poly model form Humster3D and hit publish. So far the publish never completes after 5 minutes. It seems like the publish worked in that if I reload and go to the build page it seems ok ( not sure what surprised might lurk in the call stack ) so I think it might just be the UI losing its polling. I took a screen cast of the first 2 mintutes:
I downloaded the FBX in your project. Wow, 278MB! That is huge! I imported the FBX into 3DS Max and reexported it to FBX and got a file that is 71MB. A bit better. I dumped this into a new Model Viewer project and got this:
Your project looks ‘sick bro’. We may need to ask more questions about optimizing load times and models down the road. We primarily serve mobile web and in-App so optimizing for devices is a must and not something we are very skilled at with respect to 3D.