cpobj should support multiple files to upload on the command line
$ cpobj
usage: cpobj [-h] [--version] [-D] [-V] [-A ACCESS_KEY] [-S SECRET_KEY]
[-H HOST] [-P PORT] [--insecure] [-r] [-f] [-m]
SOURCE DESTINATION
cpobj: error: too few arguments
So SOURCE should be SOURCE+ and the DESTINATION always will be the last ARGV.