It's not possible.
In Apple's work flow people use the internet to download, transfer and stream
In the real world 😀 there's not internet everywhere. Regardless, Apple does not support the wired transfer or streaming of files. However you could look for wifi enabled harddrives and use those. Basically it's a drive that makes its own small wifi network you connect your iPad to then stream from there. You usually access the files via an app on your iPad.
You can google for 'wifi enabled hard drives' and should see some options. The Kingston Wi-Drive is one example but I'm sure there are others