Using “External” Poly Playlists for maximum GoFigure luciousness:
Poly seems quite happy with .m3u formatted playlists so long as they are: Placed in the root of the SD card - not in any folders. Separator characters for files is a / Each file reference is referenced using relative paths and does not start with a /
By way of an example, here is an SD card view:
Associated playlist (specifically here including the A-HA song)
This setup for Poly/Mojo has been saved as a DAP definition in Dapper for Mac for those who use it. New update int he MacOS app store should hit this week to add support.