Got error when handling a large file

[tommy04062019]

• Log file size: 11 MB
• When asking with a file, an error has raised:

BadRequestError: Error code: 400 - {'error': {'message': "Invalid 'messages[1].content': string too long. Expected a string with maximum length 1048576, but got a string with length 11282561 instead.",
'type': 'invalid_request_error', 'param': 'messages[1].content', 'code': 'string_above_max_length'}}

What max size is allowed?How can I handle a large file?