Upload of each part is considered a PUT request.
"After you initiate a multipart upload, Amazon S3 retains all the parts until you either complete or stop the upload. Throughout its lifetime, you are billed for all storage, bandwidth, and requests for this multipart upload and its associated parts. If you stop the multipart upload, Amazon S3 deletes upload artifacts and any parts that you have uploaded, and you are no longer billed for them. For more information about pricing, see Amazon S3 pricing."
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