Cannot use accessory : Requires more power supply

I am getting error : 'Cannot use accessory : Requires more power supply ' when I am trying to transfering data by connecting 1TB Sandisk SSD with iphone 14 pro . I also use original Lightning to USB 3 Camera Adaptor for connecting powersupply and SSD. Even I use 20w iphone charger for powersupply. Even SSD is not able to detect in my phone. I tried to restart phone and plug / unplug connected device but still not working .Initially it was working but now it is giving this issue. Can please help