The adapter does not support UHS-II cards. It offers data transfers at up to USB 3 speeds on certain iPad models and up to USB 2 speeds on other iPad and iPhone models. UHS-II cards are supported by Apple's USB-C to SD card reader, but not by this specific Lightning model.
Goodbye Lukas
I have now experimented for you (and also a little for me :-)).
I created a WAV folder on the SD card, then copied several *.wav files into it and connected the whole thing to the iPhone.
If you then go to the "Files" folder on the Apple device (iPhone, iPad) and go to the top of the folder hierarchy,
you will see your memory card.
The rest is easy: tap the folder and stay on it, select Copy in the menu and place the folder in any cloud / storage location.
Does that answer your question?
According to the manufacturer, there is no information on this, it is described as follows: SD card reader supports standard photo formats, including JPEG and RAW, as well as SD and HD video formats such as H.264 and MPEG-4.
A possible solution could be an adapter. > USB-C (male) to Lightning (female) adapter plug for USB C devices < or alternatively obtain a new adapter with USB C.
Mine can only view thumbnails of the map. Apple only gives Import All or Single as options (this also applies to Adobe Express on the Ipad air 2). I imported the best ones (from the thumbnails) on holiday so I could view them normally. Note: The bigger and slower the card, the longer it takes to load the thumbnails. I therefore used smaller cards (16 GB) with higher throughput.