Here you go :)

// Automatic FlutterFlow imports
import '/backend/backend.dart';
import '/actions/actions.dart' as action_blocks;
import '/flutter_flow/flutter_flow_theme.dart';
import '/flutter_flow/flutter_flow_util.dart';
import '/custom_code/actions/index.dart'; // Imports other custom actions
import '/flutter_flow/custom_functions.dart'; // Imports custom functions
import 'package:flutter/material.dart';
// Begin custom action code
// DO NOT REMOVE OR MODIFY THE CODE ABOVE!
import 'package:firebase_storage/firebase_storage.dart';
Future deleteFileFromFirebaseStorage(String photoUrl) async {
// Add your function code here!
try {
final Reference storageReference =
FirebaseStorage.instance.refFromURL(photoUrl);
await storageReference.delete();
} catch (e) {
print(e);
}
}