I’m using the PrSw_SetPrintCopies function, but only one copy is printed regardless of the value I select (Windows)

We have found this is a FileMaker bug, that you will sometimes run into, even without PrinterSwitch installed.

With some printer drivers, this will work correctly, but with many other drivers, the PrSw_SetPrintCopies function will only work if you use the PrSw_SetPrintCollate function at the same time.