My Qubii Pro adapter worked fine with a 256GB SanDisk Extreme microSD card. I connected my iPhone Xs to it and it downloaded the Qubii Pro app from the App Store. I made a full backup of my photos and contacts and was later able to view my photos and contacts on both the Qubii app and my PC by plugging the Qubii adapter directly into a USB port and removing the microSD card and microSD card reader adapter plugged into the USB port. Read/write speeds were slow when I plugged the Qubii adapter directly into the PC's USB port; It was faster when I plugged a microSD card into my Transcend USB 3.0 adapter.
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