boto3/s3/inject.py [367:375]:
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    subscribers = None
    if Callback is not None:
        subscribers = [ProgressCallbackInvoker(Callback)]

    config = Config
    if config is None:
        config = TransferConfig()

    with create_transfer_manager(self, config) as manager:
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boto3/s3/inject.py [528:536]:
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    subscribers = None
    if Callback is not None:
        subscribers = [ProgressCallbackInvoker(Callback)]

    config = Config
    if config is None:
        config = TransferConfig()

    with create_transfer_manager(self, config) as manager:
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