I followed your instructions perfectly. And, uploaded the xml sitemap to the root folder of my website.
Then, per your 2-step instructions, I clicked on the link YOU created... to check it:
[external links are visible to admins only]
There was an error:
This XML file does not appear to have any style information associated with it.
Does this have to do with the fact that the current platform we're on has .aspx extensions for each and every page?