Am I doing something wrong? There doesn't seem to be a way to rename or copy a file to a new name.

I've tried the following:
dbxcli cp x.txt test/y.txt
dbxcli mv x.txt y.txt
Both end up with a folder (/test/y.txt or /y.txt respectively) with x.txt inside it.

I'd settle for a 'ren' command, but I'd like to see support with cp and mv commands.