Please note that you have to keep the filenames!
Please reboot the virtual appliance after changing the SSL certificate.
What can you do if you have only a PFX file available?
Run the following commands on the OE command line level (after you have copied the pfx file over to the appliance /tmp folder), to extract the private key and save it to as a KEY file:
Run the following command to also extract the public cert and save it to as a PEM file:
Afterwards copy both files (pem and key) in the /opt/panagenda/appdata/volumes/nginx folder