Believe it or not, the setup you see in the above picture works. The Fire TV Stick 2 supports OTG USB cables out of the box without needing to root the device or change any configuration settings.
Fire TV 3 supports USB Peripherals via OTG Cable — Including USB Drives, Keyboards, Mice, FLIRC, Ethernet, Hubs, etc…
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I bought a USB hub yesterday and it could not detect multiple devices simultaneously on it? It only detected the first plugin device. I uninstalled and reinstalled the 'USB root hub' but
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Fire TV Stick with wired Ethernet, keyboard, mouse and external storage
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Fire TV Stick with wired Ethernet, keyboard, mouse and external storage