>>1412218>this adapter for iphone only supports one-way transmissionPretty sure that's a lie. USB storage opens in Files, provided it's FAT32/FATX. Not sure about APFS, but no-one would use that on a SD card anyway.
https://austinmacworks.com/you-can-now-access-flash-drives-on-an-iphone-or-ipad-heres-how/