In this guide, you'll learn how to add captions on video.. First, Click Re-generate Captions to add video captions automatically.. Wait a moment, until it show Captions Generated Successfully.. Check the caption correctly. If there is wrong spelling, you can edit captions.. Lets see preview tags.. Here, you can edit the title and description.. 
You can add short captions for title and full captions for description.. You can also set the duration captions according to your audio of the video.. Then click Update..