Do you generate the site-map XML file or is there an easier way to manage and place my own XML file?

PRESSERO > *Pressero FAQs
In general, the sitemap.xml is automatically generated. But you can manually override it in the Site Settings --> SEO/HTML --> Sitemap.xml Override area. If you want to override the automatic sitemap.xml, the contents you put in this area must be a valid site map XML format (  

After you clear out the "", be sure to click save. Then you will want to clear site cache. You can read about how to do that here: Custom skin changes are taking too long to show up on my site?