404 on .well-known/acme-challenge/

I found a few other files for nginx at /etc/default/nginx
But I’m on a Digital Ocean server and following their explicit directions of where to update the Nginx file so hopefully it is the correct location. https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-14-04

Thanks,