Platform-tools R31.0.3-windows

adb pull /sdcard/photo.jpg C:\Backup : Copies a file from the phone to your Windows PC.

The version you're mentioning, r31.0.3 , is a release of these tools for Windows. Here are some key tools you might find in this version: platform-tools r31.0.3-windows

To avoid errors, ensure your Android device is properly configured: adb pull /sdcard/photo