Cannot get image transformations to work with S3 proxy.

 const client = new AwsClient({
    /* important stuff */
});

const signedRequest = await client.sign(url.toString(), {
    method: request.method,
    headers: headers
});

return fetch(signedRequest, {
    cf: {
        image: {
            width: 100,
            height: 100,
            fit: 'contain'
        }
    },
});