Thank you for the reply. Unfortunately I am on an iPad Air 3. This means a lightning connector. Flash drives and lightning connectors usually require an extra power supply, meaning more dongles and hookups. My work environment has changed, I’m actually considering upgrading to a newer iPad with a built-in cellular connection. This could be the iPad Air 4 which would then have USB-C. But for now, it seems as if the lack of a true file structure, keeps the iPad from being a better productivity device.
You should get a ravpower FileHub then you can connect wirelessly to any drive and it’s fast too the new version has 5g wifi, and at around $50 it cost the same as a apple as card reader.... add to that it’s also a battery backup too as well as other features