answered:
1. Download the Nintendo Switch Online App for iOS or Android.
2. Use the Animal Crossing: New Horizons Game-Specific Service, called NookLink.
3. Select Custom Designs to scan QR codes of custom designs and patterns created in New Leaf or Happy Home Designer.
4. Scan and download/save them via NookLink.
5. In Animal Crossing: New Horizons open the Custom Desings app and
press R to toggle over to “Pro Designs.” Then wear, display, or erase
the custom design right from this in-game app.
easy to follow images/guide via IGN