CALL FUNCTION 'UPLOAD_FILES'
I_TRUNCLEN = ' '
ERROR_FILE = 1
OTHERS = 2
IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
what we have to fill in all these parameters
in file all does I have to provide all the file names using comma or only a space.