Multipart upload S3 Policy..

s3_ploicy_multipart.json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "Stmt12345",
      "Action": [
        "s3:AbortMultipartUpload",
        "s3:GetObject",
        "s3:ListBucketMultipartUploads",
        "s3:ListMultipartUploadParts",
        "s3:PutObject"
      ],
      "Effect": "Allow",
      "Resource": ["arn:aws:s3:::bucket-name",
	                 "arn:aws:s3:::bucket-name/*"],
      "Principal": "*"
    }
  ]
}