403 Forbidden files nginx – Rubin Shrestha

I am trying to have a webpage display the subdirectories of the html such as /images/ and /js/ and their subdirectories. But my nginx config for some reason responds 403 forbidden.

server {
    listen 80;
    server_name example.com www.example.com;
    root /home/manuel/ftp/files;
    index index.html;
    location / {

         try_files $uri /index.html;
    }
    location ~ ^/(images/|img/|javascript/|js/|css/|stylesheets/|flash/|media/|static/|robots.txt|humans.txt|favicon.ico) {
          alias /home/manuel/ftp/files;
          access_log off;
          expires max;
        }

    location ~ .php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
     }

    location ~ /.ht {
        deny all;
    }
}

But the nginx error log shows

44678#44678: *4 directory index of "/home/manuel/ftp/files" is forbidden, client: 73.170.17.88, server: example.com, request: "GET /images/favicon.ico/ HTTP/1.1", host: "1.1.1.1", referrer: "http://1.1.1.1./"