I have designed PCB and was going to panelize it so I can order 2x2 panels as my first $2 order. Also I made custom cutouts as multi-layer NPTH. EasyEDA preview my PCB correctly:   But when I upload Gerber to jlcpcb.com preview looks strange:  First of all it looks like there is no cutouts. Second I'm confused why it didn't show pads and tracks on other boards. Can somebody verify that there will be cutouts as shown on second screenshot and other panels will be exact copy of first?