What you see in that link should be enough for taking care of the cert upgrades. i.e. you don’t need to stop the containers. You just need to copy the certs over to the container via docker cp and restart nginx via the command specified here.
@Marcelo_De_Guzman the key file is what you received when you were generating the certificate signing request (csr). That file is supposed to only be with you and installed on your server and it’s not to be shared with others.
If you are using Letsencrypt for example, the private key could be located under /etc/letsencrypt/live/example.com/privkey.pem, where “example.com” is your domain name.
@Marcelo_De_Guzman - checking the domain in your screenshot (chc.caremin.com), it looks like you maybe were able to resolve the issue? Just checking back with you in case you need any more help!