Identifying Drill and Slot Layers
The first step in making sure the drill and slot layers are correct is to define which files contain the drill and slot data.
This is done using the Buildup Editor in the PCB Visualizer.
Open the Buildup Editor by clicking the button in the Customer data panel (top left of the PCB Visualizer).
The Imported Layers list gives an overview of all files that have been read in.
To mark a layer as a source for drill or rout data select Drill/Slot in the corresponding selection menu.
At the top of the list you can see a quick overview of which drill and slot information is detected.
It also shows whether they are detected as plated or non-plated.