Gulp using browsersync with a given filename

Question

Hello,

Is it possible to create a gulp task to watch and reload browser-sync on change for a given file.  I try from a Terminal to prompt for a file then start a gulp watch with browser-sync for the given file but seems that is always index.html that is loaded.  I need to edit the url to add the file I want to watch like : http://localhost:3000/test.html (by default is only http://localhost:3000 which open index.html.)

The final goal is to try Emacs to call a gulp task to watch the currently edited file and reload it in the browser on change.

Thk for help.