Svg problem unable to ungroup or mask

Okay. That is a proper SVG file so you should be good to go. Try this:

  1. Import this svg file into LightBurn
  2. Select everything on the workspace (ctrl-a)
  3. Ungroup (ctrl-u or Arrange->Ungroup)

See if that frees up the shapes that you need.

There are potentially multiple nestings of groupings so if you need to further ungroup you can do that.