Plugin not working

It’s quite difficult when plugin authors don’t bother to read support requests.

The Plugin has added a link to the sitemap_index.xml https://example.com/wordpress/pdf_files-sitemap.xml
Unfortunately its assumption that my site address is /wordpress/ is wrong.

I am using htaccess to redirect this to the correct URL https://example.com/pdf_files-sitemap.xml but it would be nice if you could fix this.

Thank you.