问cos.putObject，传了key还是报错 Error: missing param Key ？

const COS = require('cos-nodejs-sdk-v5');

const config = {
    SecretId: 'xxx',
    SecretKey: 'xxx',
};

const cos = new COS(config);

cos.putObject({
    Bucket: 'xxx',
    Region: 'xxx',
    key: '/private3.0/dist.zip',
    FilePath: './dist.zip',
    onProgress(progressData) {
        console.log(JSON.stringify(progressData));
    },
    onFileFinish(err, data, options) {
        console.log(`${options.Key}上传${err ? '失败' : '完成'}`);
    },
}, (err, data) => {
    console.log(err || data);
});