code: def update(self, instance, validated_data):
          
          instance.status = validated_data["status"]
          instance.client_video_id = validated_data["client_video_id"]
          instance.duration = validated_data["duration"]
          instance.save()
  
          # Set encoded videos
          instance.encoded_videos.all().delete()
          EncodedVideo.objects.bulk_create(
              EncodedVideo(video=instance, **video_data)
              for video_data in validated_data.get("encoded_videos", [])
          )
  
          # Set courses
          # NOTE: for backwards compatibility with the DRF v2 behavior,
          # we do NOT delete existing course videos during the update.
          # Also update VideoImage objects if an image filename is present
          for course_video, image_name in validated_data.get("courses", []):
              course_video.video = instance
              course_video.save()
              if image_name:
                  VideoImage.create_or_update(course_video, image_name)
  
          return instance
docs: Update an existing video resource.