Are you getting nothing but this:?
{
"error": "Value doesn't exist."
}
when trying to upload a certificate?
The problem is that your nginx unit was not compiled with SSL support. The error message and logs are singularly un-useful in this respect.
If you install unit-1.21.0-r1 (edge) instead of the default unit-1.17, SSL support is compiled in and you will have a better time.
You’re welcome.