While the service does not support legacy FTP, it is based on a more modern variant known as Secure FTP or SFTP. When enabled, this service allows users to transfer files directly to S3 cloud storage.

AWS S3 storage bucket with unlucky name nearly cost developer $1,300 Amazon says it's working on stopping others from "making your AWS bill explode." Kevin Purdy – Apr 30, 2024 3:43 pm | 106 ...

The issue is that S3 storage buckets were designed to use predictable, easy-to-guess AWS account IDs instead of a unique identifier for each bucket name using a hash or qualifier.