SVG file dissapears by CNC module in Luban

Unfortunately I’m not sure what flat carving means.

In my opinion vector carving means toolpaths for cutting out something, for example.

For lasering I would say b/w or gray-scale is the thing you need, to fill the black parts of your picture.

Anyway, if it gets more complicated I would suggest to use another cam software like fusion 360.

Have a look at this tutorial: