There is only a green Transfer button (where usually is Play). Is this a snap package limitation (or a bug) that the actualy TRANSFER functionality (not using Valve’s servers) does not appear?

The Steam snap used is the latest / edge so the functionality should be there AFAIK. Did this work formerly with the deb package, if anyone knows? What is the issue here or how should the transfer way to install a game on other device should be activated?

Thanks.