The example yaml code need to be modified

[mun9769]

  check-settings:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - id: flutter-action
      - uses: subosito/flutter-action@v2
        with:
          channel: 'stable'
      - run: |
          echo CACHE-PATH=${{ steps.flutter-action.outputs.CACHE-PATH }}
          echo CACHE-KEY=${{ steps.flutter-action.outputs.CACHE-KEY }}
          echo CHANNEL=${{ steps.flutter-action.outputs.CHANNEL }}
          echo VERSION=${{ steps.flutter-action.outputs.VERSION }}
          echo ARCHITECTURE=${{ steps.flutter-action.outputs.ARCHITECTURE }}
        shell: bash

This is the last code in README.md.

When you run this script, github action throw error.

every step must define a uses or run key

If you swap the order of 'id' and 'uses', you can solve this.

[subosito]

The one on the README is already valid:

- uses: actions/checkout@v4
- id: flutter-action
  uses: subosito/flutter-action@v2
  with:
    channel: 'stable'

Seems you put additional - on your example.