Below is how it's done to a custom path...remove any code that's irrelevant to you
// Automatic FlutterFlow imports\nimport '/backend/backend.dart';\nimport '/backend/schema/structs/index.dart';\nimport '/actions/actions.dart' as action_blocks;\nimport '/flutter_flow/flutter_flow_theme.dart';\nimport '/flutter_flow/flutter_flow_util.dart';\nimport '/custom_code/actions/index.dart'; // Imports other custom actions\nimport '/flutter_flow/custom_functions.dart'; // Imports custom functions\nimport 'package:flutter/material.dart';\n// Begin custom action code\n// DO NOT REMOVE OR MODIFY THE CODE ABOVE!\n\n// DO NOT REMOVE OR MODIFY THE CODE ABOVE\n\nimport 'package:plugin_platform_interface/plugin_platform_interface.dart';\nimport 'package:file_picker/file_picker.dart';\nimport 'dart:typed_data';\nimport 'package:firebase_storage/firebase_storage.dart';\nimport 'package:uuid/uuid.dart';\n\nFuture<List<String>?> uploadFile(\n  String orgid,\n  String eventRef,\n) async {\n  final files = await FilePicker.platform.pickFiles(\n    allowMultiple: false,\n    type: FileType.any,\n  );\n  // Declare a list of string to receive fileNames\n  List<String> names = [];\n\n  if (files != null) {\n    final uploadTasks = files.files.map((file) async {\n      print('Selected file: ${file.name}');\n      final storage = FirebaseStorage.instance;\n      final uuid = Uuid().v1();\n      final ref = storage\n          .ref('organizations/$orgid/events/$eventRef') // CUSTOM PATH HERE\n          .child('$uuid-${file.name}'); // store the original name + unique UUID\n\n      int retries = 3;\n      String? url;\n\n      while (retries > 0 && url == null) {\n        try {\n          final task = ref.putData(file.bytes ?? Uint8List(0));\n          final snapshot = await task.whenComplete(() {});\n          url = await snapshot.ref.getDownloadURL();\n          print('File uploaded to $url');\n\n          // put file names in list of string\n          names.add(file.name);\n        } catch (e) {\n          retries -= 1;\n          print('Error uploading file: $e. Retries left: $retries');\n        }\n      }\n\n      return url;\n    }).toList();\n\n    FFAppState().update(() {\n      FFAppState().updatedFilesNames = names;\n    });\n\n    final List<String?> results = await Future.wait(uploadTasks);\n    return results.where((url) => url != null).cast<String>().toList();\n  } else {\n    // User canceled the file picker dialog\n    return null;\n  }\n}
Firebase upload control
