MyChat Client errors #0235: not verified https certificate for host "XXX"
Error
Error #0235: not verified https certificate for host "XXX"
Error description
It turned out that the certificate is invalid when downloading or uploading files on MyChat WEB server over https.
Problem solution
This problem can occur when you enable HTTP traffic in MyChat Server settings while using a self-signed certificate. It is not trusted because a browser can't check its validness.
For example, the Android system does not allow downloading/uploading files from WEB servers with untrusted certificates due to security measures. That is why MyChat for Android won't work with invalid certificates.