No problem will occur. sitemap is best for Google or other search engine crawler. they crawl your site easily with the help of sitemap. If you don't submit sitemap. No problem will be for your site.

Sitemap include all the pages in a single web page. It helps search engine to know about all your web pages and your web pages easily get crawled.xml site map is helpful to search engine. A sitemap is an xml file that the user can't see, it is only for search engines.

If we don't upload sitemap , Our On page is incomplete, sitemap is one of the most important activity in SEO, It will help search engine bot to crawl fast...

XML Sitemap is a structured format that a user doesn't need to see, but it tells
the search engine about the pages in your site.

xml site map is useful only for search engines, however for user html site map is useful.