There is a way I know on how to do this, but it is not too user-friendly... because 1) it requires linux knowledge on the "scp" command, and 2) it requires you typing semi-long linux commands on the tiny keyboard.

1) Install "OpenSSH" package (Search result, valid for 2 hours max, if deleted by the time you get around to it, please search again).
2) Install "Term-vt100" package (Search result, valid for 2 hours max, if deleted by the time you get around to it, please search again).
3) In Term-vt100, use the "scp" command to copy the file(s) back and forth

Manual of scp can be found here.

*Note: your friend should also have OpenSSH installed; and you will need to know his/her password.