UNO R4 WiFI support was added to Arduino Cloud July 12th, 2023[1].
When adding your UNO R4 WiFi to the Cloud, you may need to upgrade the wireless connectivity firmware.
- Open the Devices tab in Arduino Cloud
- Connect your UNO R4 WiFi to your PC.
- Click the Add button near the top of the page.
- Follow the instructions for updating the connectivity firmware.
Once the update is complete, your UNO R4 WiFi is ready to be managed from the Arduino Cloud.