The Brother Print SDK Demo app can be used to print image files, PDF files, and other files on Brother mobile printers and label printers. The app can be used on Android devices that are paired with a printer that is connected to the internet.

In order to use the app, you must first have the latest version of the Brother Print SDK installed on your device. You can download it from the Google Play Store.

To use the app, first, make sure that your device and the printer are connected to the internet. Next, you need to open the app and select the printer you want to use.

After that, you need to select the files you want to print. You can select one or more files.

After that, you need to click the "Start" button.