dont update ui on progress call back

[hoangtienak2]

i have progress bar and need progress upload from dio. This is my store code

  @observable
  int? uploadProgress;

Future addPost(PostBundle postBundle) async {
    PostBundle getPostBundle = postBundle;
    updateListPostUploading(postBundle: getPostBundle);
    uploadProgress = 2; // ui update 
    for (var i = 0; i < 1000; i++) {
      uploadProgress = 9; // ui update 
    }
    await Future.delayed(Duration(seconds: 3), () {});
    getPostBundle.uploadProgress = 12; // ui update 

    if (getPostBundle.files != null && getPostBundle.files!.length > 0) {
      return await uploadFile(
              listImages: postBundle.files!,
              onProgress: (va, va2) {
                uploadProgress = va;  // ui update 
              })
          .then((value) => removeListPostUploading(postBundle: getPostBundle));
    }
  }

when uploadProgress = 2 , 9, 12 UI updated nomarly
but when i set uploadProgress = va UI not update.

Please help me