The included cable should be fine for both charge and data. Have you tried the cable on a different device? If it still doesn't work on something else, contact Amazon Customer Support and get a replacement cable. Amazon isn't pulling any tricks. Their own
User Guide tells you that you can use their cable for data.
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USB-C/power port: You can use the supplied USB cable to connect your Kindle to a computer for charging the battery. You can also use the USB cable to transfer files to your Kindle. To charge your Kindle from a power outlet, you will need the Amazon 5W charger (sold separately) for the USB cable.
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