# Loading Firebase configuration > How to load Firebase configuration files into environment variables in a Flutter workflow editor pre-build script Instead of committing the Firebase configuration files to your repository, you can upload them to Codemagic as **environment variables** and reference them in a custom script. Save the **contents** of Firebase config files as environment variables, e.g. `ANDROID_FIREBASE_SECRET` and `IOS_FIREBASE_SECRET` in Codemagic UI (either in Application or Team variables) and select **Secret**. 1. Open your Codemagic app settings, and go to the **Environment variables** tab. 2. Enter the desired **_Variable name_**, e.g. `ANDROID_FIREBASE_SECRET` or `IOS_FIREBASE_SECRET`. 3. Copy and paste the config file content as **_Variable value_**. 4. Enter the variable group name, e.g. **_firebase_credentials_**. Click the button to create the group. 5. Make sure the **Secret** option is selected. 6. Click the **Add** button to add the variable. 7. Add the variable group to your `codemagic.yaml` file ```yaml environment: groups: - firebase_credentials ``` 8. Add the following **pre-build** script echoing your variables to load the Firebase configuration in Codemagic. ```yaml scripts: - name: Load Firebase configuration script: | #!/usr/bin/env sh set -e # exit on first failed command echo $ANDROID_FIREBASE_SECRET > $CM_BUILD_DIR/android/app/google-services.json echo $IOS_FIREBASE_SECRET > $CM_BUILD_DIR/ios/Runner/GoogleService-Info.plist ``` In case your project is in a nested folder structure, adjust the script accordingly: ```yaml scripts: - name: Load Firebase configuration script: | #!/usr/bin/env sh set -e # exit on first failed command PROJECT_ROOT=$CM_BUILD_DIR/myproject/path # ADD YOUR PROJECT FOLDER PATH HERE echo $ANDROID_FIREBASE_SECRET > $PROJECT_ROOT/android/app/google-services.json echo $IOS_FIREBASE_SECRET > $PROJECT_ROOT/ios/Runner/GoogleService-Info.plist ```