My NGINX conf file looks like this:

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name  site.com;
    root         /root/mysite;


    resolver 8.8.8.8;

        location / {
            try_files $uri /index.html =404;
        }

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }

}

This configuration gives me 404 error. But why? This directive try_files $uri /index.html =404; should try file and if not exist fallback to 404 error.

But I do have a file in root directory.