Building an SFTP with S3 Files on EC2
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S3 Files (launched November 2025) is the new AWS NFS file system backed by S3 buckets. Instead of testing with a “hello world”, I picked a useful case from the start: an SFTP on EC2 with /home/sftp mounted via S3 Files, files landing straight in the bucket. Along the way, four lessons the docs do not highlight: peculiar IAM principal, wrong mount type, hidden botocore dependency, and versioning that changes what delete means.