How to connect MTP to a kids profile on a Fire tablet

This is mostly a note-to-self.

I’m a father with a kid that is starting to get old enough to appreciate some screen time. To that end, we got a cheap Amazon Fire tablet (sidenote, it seems Amazon has a corner on this market).

It was nice, we set up a kid’s profile, disabled the store, disabled calling, disabled the web browser, shared VLC (for personal media) and AnkiDroid (for educational flashcards). But, then I couldn’t figure out for the life of me how to get media onto the internal storage in a way that was visible to that kid profile!

Here’s the trick:

1. Log in to the kid profile.
2. Bring down the settings menu by dragging down on the top.
3. Press and hold the Bluetooth icon until a PIN prompt appears.
4. Enter your pin.
5. The “Connected devices” menu will open, where you can change the USB setting to File transfer.
6. Now, the internal storage reflects this kid profile specifically.

Step 3 in particular was not obvious to me.