Install IONOS user managed SSL Certificate on Ubuntu 20.04 local server

I renewed a user managed SSL Certificate from IONOS. I copied the certificate to /etc/ssl/certs on my Ubuntu 20.04 server that I use for a self hosted NextCloud. Do I need to do anything else for Apache to see the Certificate? I also downloaded a private key, do I need to anything with that key.
Ubuntu 20.04 Nextcloud 19.0.1 Apache/2.4.41 PHP 7.4.3

@mnord00 Hey and welcome to the community-forum iof NC.

did you take a look into how to setup apache with ssl correctly? i.e. here:

No, but I will do that. Thanks