Send new document in existing package

I'm trying to send a new document in a package that has the status: Draft

But I get the error response

b'{"messageKey":"error.validation.invalidParameters","technical":"Unexpected Content-Disposition value for parameter \'name\'","message":"Invalid parameters.","code":400,"name":"Validation Error"}'

payload= {'description': 'Envio de documento para assinatura', 'id': 17, 'name': 'document1.pdf'}

url='https://sandbox.esignlive.com/api/packages/n4zLJaZblg1wd33HDVpVgsDIBlM=/documents'

file_request = [('file', <File: C:\Users\Test\document1_ZiJNpZN.pdf>)]

Request:

response = requests.post(url, headers=headers, data=payload,
files=file_request)

Can you help me?