I modified login-html,and login_ctrl.ts,but it does not effeft

hi,
i modified login-html(public/app/partials),add some divs and pictures ,
and also i modified login_ctrl.ts(public/app/core/controllers/login_ctrl.ts).
then i restart the Grafana server.but i didnt see any change~Even i delete login-html(public/app/partials),then restart,there is no change ,no error.
anybody have any idea,plz~

you should build from source and download the code, then modify
your code and rebuild the frontend assets and restart( https://grafana.com/docs/project/building_from_source)