Sync sets the optional parameter "sync": The sync parameter indicates whether YouTube should automatically synchronize the caption file with the audio track of the video. If you set the value to true, YouTube will disregard any time codes that are in the uploaded caption file and generate new time codes for the captions.

You should set the sync parameter to true if you are uploading a transcript, which has no time codes, or if you suspect the time codes in your file are incorrect and want YouTube to try to fix them.

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