SmartCrawl Sitemap 404 Error

Hi all,
SmartCrawl does not seem to be generating a sitemap for my website. I'm running Nginx as my web server, and I'm also using CloudFlare, if that makes any difference. I'm guessing that I need to add something to my server configuration files. Here's where the sitemap should be:

<a href="
https://jacobgerber.org/sitemap.xml">https://jacobgerber.org/sitemap.xml

I found this thread on a very similar issue, and the person who posted the thread seems to have figured out a solution, but I can't figure out where to put this line of code:

rewrite ^/(.*/)?sitemap.xml /wp-content/uploads/sitemap.xml last;

Should that go in my nginx.conf file? My server blocks in ../sites-available/? If so, what location?

Thanks in advance for your help!

Jacob