This changeset introduces the `wp_ajax_save_attachment` action hook, triggered after an attachment has been updated and before the JSON response is sent. For example, it allows developers to update any additional attachment fields that have been rendered by extending the `media.view.Attachment.Details` subview.
Props griffinjt, bradyvercher, pputzer, antpb, sc0ttkclark, audrasjb, costdev, hellofromTonya.
Fixes#23148.
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