Apple has released a new Lightning to SD Card Camera Reader for the iPad Pro. It's designed to take advantage of the (hidden) USB port inside the super-sized tablet.
With the $29 Lightning to SD Card Camera Reader, you can download photos and videos from your digital camera to your iPad Pro (as well as other iPads and iPhones). After you insert the SD card into the reader, your iOS device automatically opens the Photos app, which organizes your photos into Moments, Collections, and Years.
The Lightning to SD Card Camera Reader supports standard photo formats, including JPEG and RAW, along with SD and HD video formats, including H.264 and MPEG-4. It supports data transfer at up to USB 3 speeds on the iPad Pro, and up to USB 2 speeds on all other iPad and iPhone models.