I am trying to move a bunch of sitemap files out of my website into a separate site that just has static assets, however I am struggling to understand the cross-site submissions mentioned on sitemaps.org.
My sitemap has a lot of URLs so I have around 10 pages. To prove ownership do I need my robots.txt to include every single page of the SiteMap.xml? Or can it just include the index page? Is the robots.txt way of verifying ownership even still a thing or does Google now just treat ownership as whats verified in Google search console? The documentation around this seems unclear.
Another thing that's unclear to me is regarding the folder and subdomain rules mentioned on sitemaps.org. Do these rules go away when doing a cross-site submission as the folder/subdomain are no longer relevant? E.g. if my sitemaps are on
http://foo.example/SiteMapFiles/SiteMap.xml and that sitemap has URLs for
http://bar.example/index.html is this still valid or does the sitemap have to live at
http://foo.example/SiteMap.xml to follow the folder conventions?
Google just gives me a generic "URL not allowed" error without explaining much more.
What I have right now is. E.g.
subdomain.staticAssets.example. My sitemap files are now as follows.
I then have
https://www.example.com/robots.txt with an entry. Sitemap: