Now you have to configure this folder in the plugin settings, for the parameter "Certificate folders".It's important to do this now, otherwise the certificate import script will put the certificates in the wrong folder.
First, ensure you create a DNS entry for `room.your_instance.tld`, which points to your server.You can use a CNAME entry (or an A entry and a AAAA entry).This is necessary for Let's Encrypt to validate the domain for certificate generation.