External usb drives on lightning iPads (almost all that support iPadOS)

In the tips app preinstalled on my 2018 6th gen iPad, they show me a lightning iPad with and external usb flash drive connected to the iPad using the lightning to usb3 camera adapter. It only shows the flash drive working on the iPad with no added power. I bought the adapter (45 euros btw) and I’ve connected a simple basic usb 2.0 8gb Kingston Datatraveler G3, and it tells me it requires more power. Same occurs on my father’s 10.5 iPad Pro. Apple shows in the tips app the ability to access external drives as a new important feature of iPad OS and it advertises that thumb drives can be used without any additional power. Once I connect the lightning cable, the flash drive turns on and shows in the files app. I’ve tried multiple and different models and same happens for all, only turning on with added power. I connect my hard drive WITH THE ADDED POWER OVER THE LIGHTNING PORT and the drive refuses to turn on and I cannot use it, even the “requires too much power” prompt does not show up, with or without adding power through the lightning port on the adapter. The lightning cable connected provides [email protected] and the hard drive requires 0,5A so it should work. This feature sucks if it can only be used with basic thumb drives and connected to power after spending 45€ on the adapter. Why does apple show that a thumb drive without added power works fine and all mine refuse to turn on showing that “requires too much power” message?

iPad Pro 10.5-inch, Wi-Fi