File Upload some time get unreadable image

import 'dart:io';

import 'package:get_server/get_server.dart';

class FileuploadView extends GetView {
@override
Widget build(BuildContext context) {
return MultiPartWidget(
builder: (context, upload) {
final path = 'images/123.jpg';
var p = File(path);
p.writeAsBytes(upload!.data);

return Json({
'nameFile': upload.name,
'mimeType': upload.mimeType,
'fileBase64': upload.data,
});
},
);
}
}