Mobile applications are no longer supported in VB Studio. You cannot create a mobile application any more, but it's possible to convert an existing mobile app to a web app and deploy it as a Progressive Web App (PWA).

Once you do that, you can generate a QR code, which users can quickly scan to install the app on mobile devices for testing as well as production. This way, you can have a single application that is installable and can scale from desktop to tablet to mobile. It can also work offline if configured for offline support.

See Convert a Mobile App to a Web PWA for steps on transitioning your mobile app as a PWA-enabled web app.