Force S3 CopyObject over PutPartCopy

copy.py

import boto3
import os
from boto3.s3.transfer import TransferConfig

# Set the desired multipart threshold to an arbitrarily large value.
EB = 1024 ** 6
config = TransferConfig(multipart_threshold=EB)

session = boto3.session.Session()
s3_client = session.client(
    service_name='s3',
    aws_access_key_id=os.getenv('AWS_ACCESS_KEY_ID'),
    aws_secret_access_key=os.getenv('AWS_SECRET_ACCESS_KEY'),
    endpoint_url=os.getenv('AWS_ENDPOINT'),
)

copy_source = {
    'Bucket': 'billtest2',
    'Key': 'big4.mp4'
 }
print(s3_client.copy(copy_source, 'billtest', 'big4.mp4', Config=config))