Let us know how we can improve. Vote on existing ideas or suggest new ones.
Add a way to preview a mobile prototype on desktop browser with a device shell. Example, view a prototype in an iPhone XS.
why not just make artboards with whatever phone size you like, stick a frame of that phone in the artboard and create a button on the desktop version that say “preview on phone.” Then link that button to that artboard with the phone? Or are you trying to do something else?