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.
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Fire TV Stick 2 supports USB Storage, Keyboards/Mice, and Ethernet Adapters via USB OTG without Root
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Works with the Inteset IReTV IR receiver (Not Included) for control of your Fire TV Streamer devices. Fully tested on each Device. No drivers are needed. Supports combined use of the Fire TV Ethernet adapter for faster internet access and less buffering. Ethernet eliminates most/all buffering. Allows for easy mounting of the Fire TV Stick or Pendant devices-Length is 7 inches.
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Add wired internet and extra storage to TV streaming device ( TV stick 3rd gen, TV stick 4K Max 2021, Fire TV Stick 2nd generation, Fire TV 4K, Fire
OTG Cable for Fire TV Stick 4K Lite Max Cube, USB Ethernet Adapter with Hub to add Storage/Keyboard/Bluetooth
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Fire TV 3 supports USB Peripherals via OTG Cable — Including USB Drives, Keyboards, Mice, FLIRC, Ethernet, Hubs, etc…