If you login to GUI, do you actually see the local file having newer timestamp than the remote one?

I have a automated synchronization set up via this script:

open CSVFTP
synchronize remote "C:\Sync" "/"
exit

This script was run with:
"C:\Program Files\WinSCP\WinSCP.exe" /script="C:\ftp_auto.txt"

However, if the remote file already got a file with the same name as the local, the file will not get ftp up even if the local one is newer. How can I upload and replace the files on the remote directory regardless?

Thanks.

AL