We thought S3 Express One Zone would be a drop-in replacement for our standard S3 buckets. Instead, it took us three days to untangle the completely different SDK operation set. Here's what nobody warned us about. Our bill shocked us too - the price of faster storage isn't just about the storage itself. Introduction to S3 Express One Zone S3 Express One Zone is a storage class that provides faster data access and lower latency compared to standard S3. However, the shift to S3 Express One Zone requires careful consideration of the API differences that can break your v2 code. import { PutObjectCommand } from ' @aws-sdk/client-s3 ' ; const s3Client = new S3Client ({ region : ' us-east-1 ' }); const params = { Bucket : ' my-bucket ' , Key : ' hello.txt ' , Body : ' Hello World ' , }; const command = new PutObjectCommand ( params ); s3Client . send ( command ). then (( data ) => console .…