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

[Acorn]

Filezilla to upload. I have noticed however that the files the sitemap.xml(352kb) and robots.txt(56kbs) are uploaded with with zero kbs.

i have no suggestions other than filesizes so big are totally wrong.
Your original robots.txt of size 70 bytes was correct.

At root level, you have http://lc4mkm.xara.hosting.
This have http://lc4mkm.xara.hosting/robots.txt, which leads to:
http://lc4mkm.xara.hosting/sitemap.xml, describing a single page site:

<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><url>
<loc>http://lc4mkm.xara.hosting/index.htm</loc>
<lastmod>2019-04-21T19:15Z</lastmod>
</url>
</urlset>

The FTP Host address that I would be using is: sftp.xara.hosting. Port 22 is a default setting so you can ignore it.

I have looked at http://lc4mkm.xara.hosting/2019blog/2019blog.htm
There is a http://lc4mkm.xara.hosting/2019blog/robots.txt file but no http://lc4mkm.xara.hosting/2019blog/2019blog.htm/sitemap.xml file.

there is one for 2017;

<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"><url>
<loc>http://lc4mkm.xara.hosting/2017blog/index.htm</loc>
<lastmod>2019-09-22T13:59Z</lastmod>

</url>

<url>
<loc>http://lc4mkm.xara.hosting/2017blog/page 2.htm</loc>
<lastmod>2019-09-22T13:59Z</lastmod>

</url>

<url>
<loc>http://lc4mkm.xara.hosting/2017blog/page 3.htm</loc>
<lastmod>2019-09-22T13:59Z</lastmod>

</url>

<url>
<loc>http://lc4mkm.xara.hosting/2017blog/page 4.htm</loc>
<lastmod>2019-09-22T13:59Z</lastmod>

</url>


</urlset>

Are you able to examine the Web Space for any of these sub-sites?
https://hosting.xara-online.com/webftp > Login > open web space.

Acorn