How to automatically FTP files that I am editing

I use WinSCP for some of its amazing benefits. I connect to my FTP server with WinSCP and let it monitor my local folder /website/public_html.

Any changes I make in my local folder automatically get uploaded to my FTP server by WinSCP. The feature is called Keep remote directory up to date:
http://winscp.net/eng/docs/task_keep_up_to_date

As for SCSS, I also use it:
I have a script that opens a console window to watch my /website/scss files and compiles them to /website/public_html/styles/. WinSCP sees the CSS file has changed (or is new) and automatically uploads it.

Notice: The only downside is you cannot reach your error_log as that is automatically generated on the server by PHP. To do this you can easily instantiate another WinSCP to connect to your website. Now you have 1 WinSCP monitoring your local folder and 1 WinSCP where you can access your site map.

If by "autoftp" you mean "update the file on the server whenever I save it" and you're working with code, then I'd recommend the wonderful Notepad++

Notepad++ certainly is wonderful for this particular function and it even saves a cache of the whatever has been accessed and modified from the remote server.

The downside however (for me) is that Notepad++ will not auto-upload preprocessed CSS files like .scss or .less. I tried actually opening the resulting .css files in Notepad++ to mimic the act of editing them, but that still puts an extra step in the process. I have to click over to the tabs and manually save them (after the 'your file as changed prompt').

Currently, after I make changes, I click over to FZ and upload the files manually.