Failing works with files

Hi, I'm using this library and I got stuck.
I have an API that receives payloads with images.
so I sent the image using Postman when running the express locally work fine and the image was not corrupted.
but when I'm using the AWS cloud, sending the same request from the postman the PNG images flips bytes, and this corrupts the image when I'm saving it into the s3 bucket.
I did everything that needed to be configured in the AWS platform i think it happened because of this lib.
the png buffer data start with: ```

The issue names no repository files or tests and provides only local and CloudWatch buffer examples plus implementation screenshots. Start by reproducing the Postman PNG upload locally and in AWS, then trace where the request body is converted before S3 storage. Done means the same binary bytes reach storage in both environments.

Written by the indexing model from the issue text.