Substance Painter files are giant because they store a ridiculous amount of info, such as all of your brush strokes. This is probably excessive in many cases, but it does allow you to do cool things like paint in 2k but export in 4k at full quality, or rearrange your UV’s and re-import without losing any work. But at the very least I’d recommend deleting all the autosave files when you’re done with a project since that will save you some space.
