Why can't the Xiaomi Portable Photo Printer 1S receive printing instructions?

If the Xiaomi Portable Photo Printer 1S cannot receive print commands, please try the following troubleshooting steps:
1. Make sure the printer is powered on. If it's off or unresponsive, please restart the device and try again;
2. Confirm that your smartphone is properly connected to the printer via Bluetooth. Try restarting Bluetooth on your phone and reconnecting;
3. Make sure the Xiaomi Home/Mi Home APP is up to date. An outdated version of the APP can cause compatibility or other issues;
4. Avoid interference by keeping other nearby Bluetooth devices disconnected while printing;
5. Try restarting both the phone and the printer, then attempt the printing process again.