1. What is the issue? Please be detailed.
I have installed ODK central in a debian VM inside proxmox. I can access the webgui if I put selfsign in the .env file but then enteko won't let me test a form saying it has a problem with the certificate.
Now, what I want is to use caddy in a VPS that has a static IP and use caddy to expose my install of ODK central to the internet. But since Caddy uses his own certificate I think is more complex. I tried using the upstream certificate with no luck, I followed the documentation but there is really none on how to install it on my own server. Have any of you have managed to do this? it's for testing. I don't have a domain, instead I use duckdns. I'm not an expert on this and besides other selfhosted services with caddy I haven't published a domain or service to the internet.