WinSCP cannot do that.
Any reasonable windows filemanager allows you to flatten the directory structure. So you can upload all the files from single directory then.

I have the following structure on my hard drive, and I need to copy all files ( also the ones in subfolders) to ONE folder on my server - I do not want to copy the structure.

How can I do this in WinSCP?


--- test
......|--- 1.txt
......|--- 2
...........|----2.txt