Ok, from my testdrive today... no it doesn't take SD cards.
Media sources are either from your phone (plugged in and connected as a USB drive or streamed via bluetooth from media on your phone or from something like spotify etc) OR from some other USB device plugged into one of the two USB ports. Only one of the two USB ports is data enabled, the other is only power. They are USB-C connectors, so be careful about what choice of USB stick you are using - the old school ones won't work.
PS I was surprised to see it is HK now...I thought you'd made a typo, but no, VW is HK now and not DynAudio.