func createFile() async {
   if metaData.resultCount <= 0 {
      let manager = FileManager.default
      if let fileURL = manager.url(forUbiquityContainerIdentifier: nil) {
         let documentURL = fileURL.appendingPathComponent("Documents/myfile.dat")

         let newDocument = MyDocument(fileURL: documentURL)
         newDocument.fileContent = Data()
         if manager.fileExists(atPath: documentURL.path) {
            let _ = await newDocument.save(to: documentURL, for: .forOverwriting)
         } else {
            let _ = await newDocument.save(to: documentURL, for: .forCreating)
         }
         await newDocument.close()
      }
   }
}