This step is also very useful and i recommend you to do this last step which
helps your blog to get crawled more with this little trick. Blogger doesn't allow
to upload files on their servers. Because of that you will not be able to upload
and publish original Sitemap generated on internet.

But i can help you with this little trick which you can do with your RSS link.
Submit link from your original RSS XML file on these services and they will track
changes on it daily, just like when you upload original sitemap file.
Your RSS XML URL is like:

http://your-blog.blogspot.com/rss.xml

Then all you need is to add above address (change your-blog with your blogger
blog name) on Google Webmaster Center and Yahoo Site Explorer.
From now your contents will be much better with communication with Search
Engines. Your site will be crawled regularly and daily.
Note: You need to have free accounts from both services. Gmail and Yahoo!
Email addresses also works!