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This commit updates (writer).Writer() method in S3 storage driver to handle the case where an append is attempted to a zer-size content. S3 does not allow appending to already committed content, so we are optiing to provide the following case as a narrowed down behaviour: Writer can only append to zero byte content - in that case, a new S3 MultipartUpload is created that will be used for overriding the already committed zero size content. Appending to non-zero size content fails with error. Co-authored-by: Cory Snider <corhere@gmail.com> Signed-off-by: Milos Gajdos <milosthegajdos@gmail.com>