seo – How to temporarily host a sitemap.xml file for URLs

I have a GZ sitemap file that contains 4 different sitemaps of 50 MB each. What I want to do is I want to get all the URLs in these 4 sitemap files. I want to use https://robhammond.co/tools/xml-extract for this, but this tool requires to paste the sitemap URL. However, sitemap.xml.gz only allows you to download the XML files. So I end up with a file stored locally and not with a URL (for example, as example.com/sitemap1.xml).

How can I be
1) Host the 4 sitemap.xml files for the above tool
or
2) extract URLs from downloaded sitemap files