Saving synth presets to preset list

Don’t know if it’s already been posted, but you can save synth presets that populate the preset list .
Save in the synth/synth name/preset folder on your sd card . In the format
Number-category-name
Next time you load the synth voila it appears in the list.
You will see the last number listed if you look in the relevant preset folder.

Thanks, I had tried saving presets before but couldn't figure out what the magic combination was.