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Note: This only applies when introducing a new Authoring server, or exchanging the active Authoring server for a new one.
In order for new Authoring servers to be able to read file library data, the ContentUpload data store must be synchronized onto that server from the ShareData location.
Copy the <confirmit shared data path> \ContentUpload, including subfolders, to the <confirmitdata>\web\contentupload folder.