Just a tip:
ADB has a habit of shutting itself down without notifying the user which might cause detection issues.
Open your CMD (/Terminal) and type adb kill-server, followed by adb start-server.
It will give you a message "Start ADB Daemon on port blah blah". THEN you're good to go.
Also, if you wanna check if your device is being detected by ADB, type in "adb devices". It will give you a list of devices attached.
Wish I could help but I've never used Amazon Android devices.