sitemapindex.xml

the plugin dont create files for google
Each website within your network will have its own sitemap index and sitemaps.

For sub-domain installation, your sitemapindex will appear at http://sub-domain.example.com/sitemapindex.xml. For sub-folder installation, your sitemapindex will appear at http://example.com/sub-folder/sitemapindex.xml.

There’s always a sitemap index for your main site, available at http://example.com/sitemapindex.xml.

If you choose the sub-domain approach, each sub-domain can also have its own robots.txt. More on that in the Robots.txt section.

i can see the file generated in the server but when i try to see the files i see the webpage

my server run cpanel if its help