Show a popup when a file is modified via SFTP/FTP

I don't know if that feature already exists, I haven't seen it.
When I edit a file via FTP/SFTP, it is automatically deployed to the server on save, but sometimes I don't want to upload it automatically.
It's best to show an upload dialog just like FileZilla on save, which asks the user whether he wants to upload the file or not.

So why are you saving it, when you do not want to upload it?

There are many reasons to save a file, for example

1. To format a document, my formatters are triggered on save.
   
2. To trigger the IntelliSense, the IntelliSense and static code analysis are triggered on save in vscode
   
3. To Keep a copy in the Windows temp file in case the editor gets closed
   
4. To save a copy in the editor local history explorer so you can go back to in case you need that.
   

Personally, I really use the first 2 points above.

OK, I have added this request to the tracker:
Issue 2106 – Optionally upload file saved in editor only after confirmation
You can vote for it there.