To address the issue of your WalkPrint device not printing photos, follow these step-by-step instructions:

1. Check App Permissions: Ensure the WalkPrint app has the necessary permissions to access your photos. Go to your device settings, find the WalkPrint app under Apps, and verify that the permissions for storage and media are enabled.

2. Update the WalkPrint App: Check if there is an update available for the WalkPrint app on the Google Play Store. Open the Play Store, search for WalkPrint, and install any available updates. This can resolve compatibility issues that might prevent photo printing.

3. Image Format and Resolution: Verify the format and resolution of the photos you are trying to print. For best results, ensure that the images have a resolution of at least 300 DPI. Low-resolution images may not print correctly - learn more.

4. Restart Devices: Sometimes, a simple restart can resolve issues. Turn off your smartphone and the WalkPrint printer, wait a few seconds, and then turn them back on.

5. Select the Right Photos: When you attempt to print photos, ensure that you are not selecting unsupported file types. JPEG and PNG formats are generally well-supported. If certain photos are not appearing in the app, confirm that they are compatible formats - learn more.

6. Printer Status: Check if the printer shows any error messages or blinking lights indicating a problem. Make sure it's correctly paired with your mobile device via Bluetooth.

7. Connection Issues: Ensure that the WalkPrint printer is within a reasonable range of your smartphone and is connected properly. Disconnect and reconnect if necessary.

8. Test with Different Images: Try printing different images to determine if the issue is specific to certain photos. If some print while others do not, you may need to adjust or replace those images.

If these steps do not resolve the printing issue, consider seeking support through forums or discussing further with customer service to diagnose any underlying technical problems with your device - learn more.