WinSCP won't do it for you.

But it's easy to implement. Just call Directory.EnumerateFiles and call Session.PutFiles for each found file.

There's an example for a download, if it helps you:
https://winscp.net/eng/docs/script_download_files_to_same_folder

I am using

Where localDirectory is c:\temp\
But it wants to recreate the local directory structure in the remote location.
How do I just get it to put the files, without the structure, and not including any sub folders?