Rollback function available?

Does WinSCP have some kind of rollback function available? Here is a situation, a couple of our co-worker who use SFTP to upload files on RedHat based servers insists that WinSCP might have rollback faction. They keep session for a day or more and noticed updated file seems to be rollbacked as before they uplaod the files. Is this possible to happen or they just making mistakes?
Thanks for your help.

There is no such function in WinSCP. Of course, your server may have such function, but I doubt. If you find any explanation, let me know.

Thanks, Martin