Rectangular PCB cutout not showing in Gerber's

[FotatoPotato]

Hi all,

So I'm working on a front panel for a project and I want to make it using a PCB. I finished making it in Altium and in both the 3D viewer and the built-in Gerber viewer the rectangular cutout at the top left comes out fine. (Note, you can't see the text in Altium because the layer colors are the same for some reason). But when I upload my Gerber's to JLCPCB everything except the rectangular cutout shows as you can see in the pictures that I linked. I have tried a bunch of things to solve this but nothing seems to work, even adding milling guides and cutouts don't work. Do you guys know how I can fix this?

I'll link my Gerber's and all of the pictures.

Thanks 

[KL27x]

You might try putting this in the PCB section of the forum.

I don't use Altium, but is is possible you put that rectangle in the soldermask or maybe a copper layer on accident? I notice there's no white line in the rectangle; there is a white line in all the other holes. Also, you can't mill a perfect rectangle. You need to radius the corners, and if your radius is too small, there may be an extra charge for swapping tooling.

Each manufacturer has a default smallest radius they use for routing, without swapping bits to a smaller bit (which cuts slower, wears out faster, and potentially breaks more frequently).