How do I move Kodi's data to external memory on an Amazon Fire TV?



I have a FireTV light Stick. I added and formatted my USB drive to expand internal storage. I then moved Kodi to the USB drive. However, only the application moved but not my more than 2 GB of data. I found this thread: https://forum.kodi.tv/showthread.php?tid…pid2237666
with instructions on how to move the data as well, but I am confused already at the first step:

Create a file on your AFTV called, “/mnt/sdcard/xbmc_env.properties”

How do I create a file on the USB stick? I can’t do it on the FireTV or on my PC because the USB drive cannot be accessed with the FireTV file formatting.

p.s. I originally posted my question in the old thread above, but I didn’t get any response so I deleted the post there and posted a new one here.