Transferring SD card data to iOS, fast

Jason Snell, Six Colors:

When I’m traveling with only my iPhone and iPad, I can record audio on an external device—an SD-card recorder from Zoom, usually—but how do I get those files onto my iOS device? iOS can’t see the contents of a standard SD card.

And:

It’s still a little bit silly that, now that iOS has a file-management app, you still can’t plug in a mass storage device via a USB adapter and copy files off of it directly.

And this from John Gruber:

Apple even makes an SD card reader for iOS devices. It just seems downright wrong that it only allows you to import photos to your camera roll. Clearly a connected SD card ought to show up as a source in the iOS 11 Files app, right?

To me, the inability of iOS to handle external drives, SD-cards, etc., is a barrier to an iPad becoming a first class computing citizen.