Project IDX currently runs the apps on virtual emulator in browser but there is a thread(in IDX Community) related to running the application in physical device using FireBase App Distributions link:Firebase App Distributions which is mentioned in the IDX Community Post IDX Thread by the Maintainer Team member of Project IDX and you can get updates related to it there. But as of now there is no direct possibility of connecting physical device to the project idx workspace like traditional AVD in Android studio.