What is in the Current Webpage Preview pane is not found on the web.

[Emmo]

I am having trouble with the Publish website option as I get an FTP error Failed initialization problem which I raised on the Dear Xara forum.
Magic suggested exporting the website and using Filezilla. I did this successfully but then got the 404 File Not Found error. When I looked at the size of the sitemap and robots files in my folder and the size on those uploaded they used zero memory. I sorted this and now they now mirror each other. Using the Preview currnt website option I have no problem. But the 404 error is shown in Firefox and Edge.
Windows 10. Xara Designer Pro 11. Be nice if they gave me Pro 12 to download to see if the FTP bproblem follows.
http://lc4mkm.xara.hosting/2021blog/2021blog.htm is the site. Should I add other files here though xml is not allowed?