Why does the recording task succeed after starting recording, but the whiteboard is not displayed in the recorded video?

The video recorded through StartRecord does not display the whiteboard. There may be the following reasons:

• If the MixMode parameter is set to "1 (custom layout)", and all windows' ViewType are set to "1 (audio and video)", the whiteboard is not displayed. Only audio and video streams are displayed in the order of audio and video stream publishing.
• The room RoomId has never used a whiteboard.
• The HasWhiteboard parameter is set to "false (do not record whiteboard)".
• WhiteboardId is not passed in.