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Yes, it can't write to parts of a file.

It also can't read (seek) into the file (or couldn't when I last looked at it).

It is not a file system, but is often mistaken for one.

You can request specific byte ranges from S3 objects. It’s had this feature since at least 2012.

Thanks for that.

I've been able to pass byte offsets and ranges to S3 requests.