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The problem was an incorrect AWS API gateway setting. After adding necessaries binary media types there (like image/jpg, image/png) the image files were successfully uploaded and totally matched with originals.
Hi,
S3 does not change/manipulate objects. Once an object has been uploaded to S3 bucket, it remains same, no matter how many times you download it.
The ETag represents a specific version of the object. It reflects changes only to the contents of an object, not its metadata. The ETag may or may not be an MD5 digest of the object data. Whether or not it is depends on how the object was created and how it is encrypted as described in the following documeantation:
https://docs.aws.amazon.com/AmazonS3/latest/API/RESTCommonResponseHeaders.html
Thanks.
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