Attempting to add new metadata filed (specifically cache-control) to files hosted on Amazon S3 does not work. The new metadata filed and value can be entered and adjusted in Cyberduck, but it does not save to the S3 server.
Editing an existing metadata field (one created from within the AWS interface) works as expected.
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I suppose the issue that you don't make a modification to the default value. Because the value remains unchanged, it is not detected properly there was any editing even if you press Enter and the textfield looses focus.