I created a simple circuit (project TrailerWatch) to add a power supply and connectors to a Particle.io Photon development board. Most of the top and bottom layers are copper floods. But after receiving the boards from JLCPCB, I find that the copper floods are missing, making the boards useless. I should have caught this error using the Gerber Viewer, but it didn't catch my eye because the viewer I used colored the board and the top copper green, and it just didn't occur to me that something so basic would be missing. If this is a bug, please fix it. If it's a 'feature', please tell me what I'm missing.