Device File Explorer option missing in Flutter Android Studio

Open Flutter project and check the Event Log if Android framework is detected. If so, click Configure and you're done.

1. Go to Project Structure.

2. Click tab Modules on the left sidebar.
3. Click your project and click the plus icon.

4. Add Android in the Framework

5. Click OK to finish.

Ref: https://github.com/flutter/flutter-intellij/issues/4994#issuecomment-856999849