The mesh I uploaded was not a closed hull (not airtight, non-manifold) I guess this is the cause, but it’s not mentioned on the wiki that it’s a problem to have open meshes, so not quite sure if that’s it or not
The ambiguous error I got: “Error while creating named asset: Could not upload MeshPart”. Requiring meshes to be closed hull just seems like a weird limitation, especially to get such an ambiguous error from it.
I don’t think i completely understand what you’re saying, but i do know that the open hull has nothing to do with the error you’re receiving. Could you perhaps message me the file so i can take a look at it?
How would I send it to you? I think it saved as like 5kb or so
You can click on my character icon and select “Message”, then you can add the file to that message and submit it!
Can you send me the mesh file? We’ll take a look and see what’s up with this mesh.
It says that the file type is not authorized… 
Have you tried Dropbox?
Try compressing the file, I think Discourse accepts .zip
.fbx and .obj files should now be valid file types.