You can add closed captions to videos, ads, remote assets, or YouTube videos.
|.TTML (formerly DXFP)||TTML (Timed Text Markup Language file. Generally, a closed caption file will have a .dfxp (Distribution Format Exchange Profile) extension. For details, see Supported Closed Caption DFXP (now TTML) Format.|
This example adds closed captions to the IzNnllMjphu2XF3_UgPROoCi9B2rtWs asset:
Backlot returns a 200 response.