Help with Bluetooth MIDI/MPE from iPad Air 3

So I bought an app called Velocity Keyboard, which apparently has MPE support. Though I connected my iPad Air 3 to my gaming desktop, the app doesn’t recognize it as a Bluetooth MIDI destination, so doesn’t Audiobus. Do I need to install a driver. I just want to try out the MPE features of Newfangled Audio’s Generate without having to buy a Linnstrument.