A company runs its legacy web application on AWS. The web application server runs on an Amazon EC2 instance in the public subnet of a VPC. The web application server collects images from customers and stores the image files in a locally attached Amazon Elastic Block Store (Amazon EBS) volume. The image files are uploaded every night to an Amazon S3 bucket for backup. A solutions architect discovers that the image files are being uploaded to Amazon S3 through the public endpoint. The solutions architect needs to ensure that traffic to Amazon S3 does not use the public endpoint. Which solution will meet these requirements?