Airprinting files (iOS) Note: Only photos and documents can be printed. Open Qfile Pro on your mobile device. Tap on the app bar. The Device List window appears. Tap a QNAP device to select it. The Folders window appears. Identify a file, and then tap . The file and folder action menu opens. Tap Airprint. The iOS Print Options window appears. Under Printer, specify a printer. Optional: Under Copies, specify the number of copies to print. Optional: Under Paper Size, specify the paper size. Tap Print. Qfile Pro prints the file.