How to add android devices for flutter preview, from blank template?

When starting firebase studio with the `flutter` template, devices are connected:

```
adb devices
List of devices attached
emulator-5554 device
localhost:5555 device
```

When I start an empty template in flutter, these devices are not installed:

```
adb devices
List of devices attached
```

How can we install these devices, in an empty template?

To try to answer this question, I looked into the 3 flutter related directories in `data-connect`, but I am not sure this is the right place to see the `flutter` template?

Thanks!

Compare the `flutter` template with the empty template, focusing on the setup that produces the shown `adb devices` output. Determine where template setup is documented, then document reproducible steps for making the Android devices available in an empty Flutter template and verify the result with `adb devices`.

Written by the indexing model from the issue text.