DigitalOcean Spaces put-bucket-policy no effect

I’m trying to set a folder in a bucket as public via aws s3api cli. aws configured with access key and secret for All Permissions.

//policy.json
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "Public Images",
            "Effect": "Allow",
            "Principal": "*",
            "Action": [
                "s3:GetObject"
            ],
            "Resource": [
                "arn:aws:s3:::my-bucket/uploads/images/*"
            ]
        }
    ]
}

 aws s3api put-bucket-policy --policy file://./policy.json --endpoint=https://my-bucket.sfo3.digitaloceanspaces.com --bucket my-bucket

The command runs without error. Also, I get a my-bucket file at the root of the bucket with the same contents as the policy.json file. But I still get Access Denied when trying to acces files in https://my-bucket.sfo3.digitaloceanspaces.com/uploads/images/

Am I missing something?

Thank you Mat