1
Find the Superflow Toolbar and click the three-dot menu at its right end

2
Click Open in Mobile
A QR code appears on the screen.
3
Scan the QR code with your phone's camera
Tap the link that appears. The page opens on your phone with the toolbar active, so you can keep commenting from there. Comments you leave on mobile are tagged with the device, so your developer knows which viewport the feedback is about.