I see that SketchUp is working fine for you. That means you are publishing to localhost, meaning that you installed a Collaboration server. Correct?
When you publish the Revit sample, did you save it to local disk or to Omniverse (localhost)?
There is more to the Revit file than it appears in Omniverse. There is a top-level project.usd which is usually very tiny (14k sounds about right). But if you look in Project Files, you will find another folder for that model. Digging in one level deeper and you’ll see the USD for the Revit file.
SketchUp, Rhino and Revit save to a project structure in Omniverse so that you can save a number of different models to the same project and they will not erase/overwrite each other.
If you could include a copy of the Publish dialog when you save from Revit, that would be appreciated. Here is what I utilize:
And here is what it looks like in Omniverse (in Chrome, you can go to localhost:8080 to look at Omniverse on your system):
For me, the rac_basic_sample_project.Revit.usd is 6Mb.