The “Upload” button on the edit strip of icons could be confusing, it should not be upload it should be import in my opinion.
The uploading takes place between the user and their webserver, so lets not confuse them.
The action of bringing the model inworld from a webserver is not uploading anything, it is mapping to the url, the domain never receives the file. The user client then downloads it from the webserver, so I feel the word upload is not suitable in this context.
Just try to explain the whole upload sequence to someone and you will see what I mean.