title: How to add a screen sharing feature on a video call of Twilio?
body: <p>I implemented a video call using Twilio by <code>react</code> as <strong>frontend</strong> and <code>Ruby on Rails</code> as <strong>backend</strong>.<br />
  now I wanna add <strong>screen-sharing</strong> on that.<br /><br />
  Have I to change my backend code?<br />
  How to add a <strong>screen-sharing feature</strong> on a video call?<br />
  When I <strong>enable</strong> screen sharing in video calling, does my call change to an <strong>audio call</strong> automatically?</p>