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Hi,
Take note that the scenario did NOT say that they were able to decrypt smaller files. It only said:
“…they tried to upload a smaller file with the KMS key, the upload succeeds.”
It clearly said upload, not decrypt. Kindly check the provided explanation and reference links:
https://aws.amazon.com/premiumsupport/knowledge-center/s3-large-file-encryption-kms-key
https://aws.amazon.com/premiumsupport/knowledge-center/s3-multipart-kms-decrypt/
