@szyba91 What do you mean with: does not work? The copying or the script?
For copying Filezilla also support a upload option with the right cick on the file. SImple Double-Click also copies. Did you set the number of transfers to 1 in the settings? The ftp server in the xxPy devices is pretty limited.
I had never problems using ftp for file transfer, but I'm using FireFTP, which is a Firefox plugin. That is convenient because I have firefox open anyhow almost all the time.