How a first homeyboard. github. io/board/?id dashboard convert to a virtuele dashboard

The first dashboards where outside of Homey gesaved.
Later you have to make virtuele ones under Dashboards.

Now I have problems with my browser.
3 virtuele ones I can see then in the other browser.

The by @skogsaas made dashboard sadly not.
Every dashboard give a link with “save” beneath the file but that is not working.
So making a virtuele dashboard with copy/past is not possible.