Some of your users in different parts of the world are complaining about slow upload speeds to your S3 bucket. What can you do about it?

You can use transfer acceleration to improve upload speeds to S3. With this service, your users wouldn't upload directly to S3. Instead, you would give them a distinct URL for CloudFront's distributed edge locations. Thus, a user would upload to their nearest CloudFront edge location, and the file would be transferred to S3 via AWS' internal networks.