Unless you have some logs we can inspect, there's no way we can help you. Sorry.
Hello. I needed to copy extremely valuable information from the Ubuntu server to a portable hhd connected to win10. During this process, I always double-checked that files transferred successfully (by viewing them on the WinSCP file manager) before deleting them on Ubuntu. Today, my boss told me that there are missing files on the Ubuntu server and portable hhd. But I'm hundred percent sure that wasn't my mistake. Please, help me with this situation. I think, my boss is going to fire me.