Other USB adapters for may or may not work for iPhone or iPad. Many USB adapters do not have enough power for your iPhone or iPad to access the device. [1] X Research source

If you receive an alert that says your device cannot use your accessory because it requires too much power, either your USB adapter or flash drive is incompatible with your iPhone or iPad. Some larger USB drives, such as an external hard drive, will not work with an iPhone or iPad, even with the USB3 Camera adapter.