Was reading that page. What it specifically says is:

> The size of the blob or None if the blob’s resource has not been loaded from the server.

That's pretty vague imho, because there is no high level overview or tutorial to tell you that you need to explicitly cause the load from the server. Point in fact, the function you need to use is "reload()", and the documentation of this func is "Reload properties from Cloud Storage." To me, the "re" part makes it a bit of a misnomer - as it implies there would have been some sort of initial load in the first place (there is not.)

Imagine if the interface for going to a web page in chrome was: 1. Type the URL in the location bar. 2. Hit "refresh."