For people who are having the same problem here is where to change your tablet settings on the Galaxy Tab S5e to turn USB debugging on:
Click the Settings button / app.
scroll all the way down to Developer options and click that
At the top of this screen make sure the developer options is “on”
Scroll down to Debugging section
Click the USB debugging to “on”
You will be asked later if you want this on all the time. Hit “ok”