You would be well advised to ensure that both the hub and any connecting cable supports USB3.0/3.1 standards as USB2.0 is quite slow by comparison. Most readily available USB hubs will present physical USB Type-A connectors USB-C connectors are less common on anything other than the newest computers and mobile devices. It’s worth reiterating that whilst your drive may be formatted correctly, for compatibility with iPad, it must not have multiple partitions.
If the problem with your external WD drive is due to inadequate power, then a powered USB hub may help.
