iam-bucket-write.json

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": "s3:*",
            "Resource": [
                "arn:aws:s3:::[[YOUR-BUCKET-NAME]]",
                "arn:aws:s3:::[[YOUR-BUCKET-NAME]]/*"
            ]
        }
   ]
}