I designed this Makro-Pad in EasyEDA Pro. I used a microcontoller and leds, that require a hole i the PCB. At first i had issues with the hole of the microcontroller. Although the part would show a cutout in the 2D and 3D viewer, but it wouldnt in the gerber reviwer of jlcpcb. The LEDs cutouts were completely fine. I fixed this issue by adjusting the board outline to my microcontroller cutout. But a soon i checked the gerber viewer again, the led cutouts were irreversebly gone, but the holes for the keyboard switches were still there So i tried to add the cutouts by myself, with a board outline and with the slot region tool. But they wont show in the gerber viewer of jlcpcb, altough visible in the EDA 2/3D viewer. How do i add the holes back?

gerber viewer JLCPCB

2D Viewer