It not difficult to write WinSCP extension that does this.

For a start, see
https://winscp.net/eng/docs/library_example_download_clipboard

Hello Sir
I really love WinSCP and I want to request for this new feature.

Suppose we are working on a git project, After editing some files, we can use `git status` to check list of files Which had been changed.

So, You can add some GUI like textarea, Where we can paste relative paths of files, Which had been changed while working
OR
We can let WinSCP do this for us, execute `git status` command in the background, parse the response to create a list of files, Which has been changed and let User upload them to the server in relative directories.

Thanks