How to do Visual Studio integrated Browser Sync detect specific file changes?

I was trying to give opportunity to the VS plugin to sync with the browser. Until now I did it through gulp.

But when I modify CSS files inside my wwwroot directory it does not do any purpose to update.

There is some way to specify specific routes for him to take into account. Browsing the options I see that the .css extension is supposed to be included and is not ignoring any route that interests me. So I do not know. If anyone could comment on this, I appreciate it. Thanks in advance.