SSL and Sitemap

I enable SSL thru Cloudflare. Do I need to generate a new sitemap for https://? Currently, my sitemap is still in HTTP:// and so far no issue. Thanks

If your site is now using HTTPS, then your sitemap should reflect that.

A month ago, I changed to Pro and enabled " Always Use HTTPS - Redirect all requests with scheme “http” to “https”. This applies to all http requests to the zone." function. Now, http://www.mydomain.com (my site) will redirected to https://mydomain.com. I checked sitemap is still in http://www.mydomain.com. Do I need to change sitemap into https://mydomain.com or not.

You need to change that.