Presets
Presets are distributed as a zipped folder of individual preset files. Copy the folder to your MicroSD card. You can then load them directly from the card using 'Load from SD card', or you can install the whole set to your module's flash using 'Load from folder to'.
Poly Wavetable presets by Trk-el-son
Exciters
Exciters are used by the Poly Exciter algorithm. They go in an 'exciters' folder on your SD card.
Examples
Tools repository
Various tools and scripts are here.