Document description:
privkey.pem     Certificate private key
fullchain.pem   PEM format certificate with certificate chain (nginx/apache)
root_cert.csr   Root certificate
cert.csr        Domain name certificate
fullchain.pfx   Certificate format for IIS

How to use in the aaPanel:
privkey.pem         Paste into the key entry box
fullchain.pem       Paste into certificate input box
