Plugging in a flash drive into my iPad or iPhone

I saw this question asked a few times but I am not clear about the answer.

iPad USB3 adapter power - Apple Community

I purchased a Apple Lightning to USB Camera Adapter to plug a flash drive into my iPad or iPhone, however, when I tried it, it said on the screen it cannot use the accessory because it requires too much power. Do I need to get a USB hub, plug the Lightning to USB Camera Adapter into the iPad or iPhone, then plug the USB-A from the USB hub into the Lightning to USB Camera Adapter, and then use another cable to connect the USB hub to the wall outlet? Would that work?