const filePath = "temp-file-to-upload" // Local file path
cos.putObject({
   Bucket: 'examplebucket-1250000000',
   Region: 'COS_REGION',
   Key: 'exampleobject',
   Body: fs.createReadStream(filePath), // Uploaded file object
   Headers: {
       // CI's persistent processing API during upload
       'Pic-Operations': '{"is_pic_info": 1, "rules": [{"fileid": "desample_photo.jpg", "rule": "watermark/3/type/1/image/aHR0cDovL2V4YW1wbGVzLTEyNTEwMDAwMDQucGljc2gubXlxY2xvdWQuY29tL3NodWl5aW4uanBn"}]}'
  },
}, function(err, data) {
   console.log(err || data);
});

cos.getObject({
    Bucket: 'examplebucket-1250000000',
    Region: 'COS_REGION',
    Key: 'exampleobject',
    QueryString: 'watermark/3/type/1/image/aHR0cDovL2V4YW1wbGVzLTEyNTEwMDAwMDQucGljc2gubXlxY2xvdWQuY29tL3NodWl5aW4uanBn',
}, function (err, data) {
   console.log(err || data);
   fs.writeFileSync('filepath', data.Body);  // Save the image locally
});