Cannot add HTTP SSL certificates to config

I am trying to set up remote access to my HA using Let’s Encrypt and DuckDNS. I have set up my DuckDNS domain and the add on. I have set up Let’s Encrypt. I am attempting to add the http file paths to my configuration YAML and HA is unable to find the paths I enter in. No tutorial or forum I have been able to find references this problem. I would appreciate any help here. My HA is installed on a Raspberry Pi 4 if that is of relevance.