file method
Gets uploaded file for the given field name from multipart form data Returns null if key not found or request is not multipart Note: Files are only from multipart form data body, not from query parameters
Implementation
Future<UploadedFile?> file(String key) async {
await _ensureParsed();
final files = _fileBag[this];
return files != null && files.containsKey(key) ? files[key] : null;
}