example bucket policy

gistfile1.txt

{
    "Version": "2012-10-17",
    "Id": "Policy1540246581673",
    "Statement": [
        {
            "Sid": "Stmt1540246577650",
            "Effect": "Allow",
            "Principal": {
                "AWS": "YOUR_ARN SHOULD LOOK LIKE arn:aws:iam::some_numbers:user/your_username "
            },
            "Action": "s3:PutObject",
            "Resource": "arn:aws:s3:::YOUR_BUCKET_NAME/*"
        }
    ]
}