Wait... so can you not access the file system on an iOS device? How do you transfer music and stuff? Like real FLAC files and stuff... wait... you don't have an SD card port?
How do you people use iPhones?
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All the Apple addicts who needs something like that use sort of similar accessories:
https://www.apple.com/uk/shop/product/MJYT2ZM/A/lightning-to-sd-card-camera-reader?fnode=97
