What Is The "correct" Way Of Modding Sounds In Tsw6

I've built a sound mod - extracted everything from the pak files, edited and repackaged via the Unreal editor, and put those files back in the correct file structure but I can't seem to get it to cook using the TSWModdingFolder. I get to the power shell bit and it just creates an empty file and no pak. I'm using unreal 4.27.2. I've also tried this in the Mod Manager of the editor -it loads for a while then fails. I'm at a bit a loss and there's not much info about it online. Someone please help a noob.