nameConflict not work

[kaich]

let copyRequest = self.client?.drive()?.items(self.rootPath)?.item(byPath: fromCloudPath)?.copy(withName: toCloudPath, parentReference: toParent)?.request().nameConflict(ODNameConflict.replace())

when I copy a file to the target path. When I use ODNameConflict.replace()). It doesn't work file. It still rename the file when target file exists.