Multiple-Screens application

Why is file sharing from mobile not available when multiple-screen mode is enabled?
Currently, Mobile devices (Android/iOS) in multiple-screen mode can only support screen-mirroring.
Fri, 28 Jun, 2019 at 4:15 PM
Why is multiple-screen mode not available on Chromecast?
This is due to a limitation with native Chromecast at present.  
Fri, 28 Jun, 2019 at 4:16 PM