Fortunately, Symetri offer support on post processors therefore if you need help, we are here. As the Generic Centroid Post Processor is lacking improved support for Rotary Axis and has no support at all for Fusion 360 Probing, the Fanuc Post Processors from the Autodesk HSM Post Library have. Autodesk provides you with 3 axis generic posts in your library.

I would look at the tools in your file you posted but I can not look at tools or even make changes to a toolpath at the moment to they find out why that part of fusion is not working for me at all, I can check a setup and post a g code and that's it. This Fusion 360 Post Processor was originally based on the 'Generic milling post for CENTROID' Version 42683 from the Autodesk HSM Post Library. Just check that and run a code on your machine as a air cut and see if it stops with a M1 or just stops on the coolant call M7 or M8. So check all your tools and make sure the coolant is set to off or what type of coolant method you are useing, I have seen this problem quite a few times and it has just been the coolant setting in the tool library. If you post from the use installed post libury with the new Mach3 post it should be putting out an error and saying there is a invalled coolant mode, one of your tools will have one of the coolant settings set wrong you set them all to nothing or what coolant method you are useing for all, I think this is where the problem is. Machine Library for Fusion 360 This is the place to find generic CNC machines.

Finding a Post Processor: Visit the Autodesk Post Processor Library to find a Post Processor with Fusion 360, HSMWorks, or Inventor CAM. Fusion 360.app/Contents/Libraries/Applications/CAM360/Data/Translations/germande.xml. Find a post processor in the online library which includes the most up to date posts. Information is needed on how to find, edit, or request post processors for Inventor CAM, HSMWorks, or Fusion 360. That could be part of the problem, I have the G Code you posted running it seems to be fine so far, it does have a M8 in the wrong places what is ok for the tormach machines. Start here to learn the basics of using post processors in Fusion 360.

Fusion 360 post processor library