Nice to hear that your last sessions were great!
Regarding your questions. For now the attach feature is only available in the web app but we’re working on mobile support as well.
CoSpaces Edu supports WebVR. With that it’s possible to experience VR applications in the browser. The newest versions of Firefox and Edge support it already. But Oculus is recommending Firefox (on Windows) for the Rift headset. So when the Oculus Rift is connected and you open CoSpaces Edu in the newest Firefox browser there should be a “VR headset” icon in the bottom right hand corner.