I completed all the steps mentioned in this article. But getting an error.
https://awstip.com/building-an-image-uploading-system-using-aws-lambda-and-s3-d41b93ea000d

Got an error

"Access to fetch at 'https://xxx/mystage' from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource."