4 Not Supported: Generic External Storage
Apparently, while you can move photos and videos to your iPad Pro with the new USB-C port, you cannot use it for general file reading or transfer. Essentially, that means that your iPad Pro cannot read non-media files. You can’t put a document or text on a USB-C drive and expect the new iPad Pro devices to be able to access them. Still, this could be a feature that Apple adds in a future version of iOS.
While we haven’t been able to confirm firsthand that this true on the new USB-C iPad Pro, there were easy workarounds for Lightning iOS devices in the past (shown above).