Mjm100 Support for iOS & Android was stopped some time ago- since so many of the major phone-based VR creators have stopped supporting their products (Google with the Cardboard & Daydream, FB/Meta/Oculus with the GearVR, etc), it made updating the app for those devices impossible and support for Android no longer tenable. As such the app you're using is outdated and will not have the same functionality as the current version of that app.
Plus - shifting efforts away from the iOS/Android app allowed for refocusing on the app for dedicated VR headsets, which can offer a much better experience all around vs a phone-based headset.
Which is all to say that as doublevr mentioned it might be worth considering an upgrade if you're in a position to.