Hi folks. I just want to communicate an important known and solution in Preview 4
Important Known
For deployment to additional platforms such as Android, iOS, HTML5, Linux, and TVOS you must have the optional “Editor symbols for debugging” installed. This is available via the Launcher by selecting “Options” on the .0 Engine slot. This is a transitional phase to new functionality, and the workflow will be improved in upcoming releases. (issue resolved with Launcher update)
Cheers