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Can I request a screenshot of what your preset folder looks like along with your .mat file?It'll help us out to find a solution.
When you go into Preset Maker, does the preset show up completely on the number you've chosen?It'd be easier to help ya out if we could see what might be wrong.There's not much detail for us to go on.
When you say it won't export, are you clicking the export button, and nothing happens? Or do you click it and it says it exported, but nothing shows up in your files? Is there any type of error message you get when trying to export it?