What file type do you save your sheetcam files in? With Fusion 360 they were .nc files. What I found on Sheetcam seems to be .tap files.
G-code doesn’t have a fixed standard file extension. .txt, .nc .tap are the most commonly used. You can change the extansion in SheetCam by going top Options->machine->post processor. In there you will find an option to enter your prefrerred file extension.
Firecontrol can use either format. .nc from Fusion or .tap from Sheetcam.