I tried to synchronize a currently open database with a one in dropbox and it threw me the following error.
dropbox://KP/db.kdbx (KeeCloud Dropbox credentials)
An exception occurred during a WebClient request.
This property is not implemented by this class.
I did set the username to the title of an entry in the same database that has the dropbox username and password. Just to let you know, I did use the URL credentials wizard to get an username and password.
The same error occurs when I try to open a database in dropbox.