Validation Message on upload file

Hi master, 
I have some functions to upload invoice images
This is my rules : 

PHP Code:

public function upload ()
{
   if (!$this->validate([
     'invoice' => [
     'rules'  =>    'uploaded[invoice]|is_image[invoice]|mime_in[invoice,image/jpg,image/jpeg,image/png]|max_size[invoice,2048]',
     'errors' => [
       'is_image' => 'Invoice must be pictures.',
       'mime_in'  => 'Invoice must be jpg/jpeg/png.',
       'max_size' => 'Invoice must be jpg/jpeg/png.',
       'uploaded' => 'Invoice must be uploaded.'
      ]
   ]
 ])) {
    $validation = $this->validation;
    session()->setFlashdata('fail', 'something wrong, please check your input form!');
    return redirect()->back()->withInput()->with('validation', $validation);
  } else {
    echo "OK";
  }
} 


This is my view : 

PHP Code:

<form action="/Management/upload" method="post" enctype="multipart/form-data">
<?= csrf_field() ?>
   <label for="invoice" class="form-label">Invoice</label>
   <input type="file" class="form-control <?= ($validation->hasError('invoice')) ? 'is-invalid' : ''; ?>" id="invoice" name="invoice">
   <div class="invalid-feedback">
      <?= $validation->getError('invoice'); ?>
   </div>
</form> 


This is my controllers :

PHP Code:

public function invoice ()
{
  $data = [
    'code' => $entertaintCode,
    'company' => $this->CompanyModel->findAll(),
    'entertaint' => $checkEntertaint,
    'validation' => $this->validation
  ];
  return view('management/invoice', $data);
} 


When I tried to upload files such as PDF or anything else except images, validation worked but there was no error message on my input file.

What version of CodeIgniter are you running?
CodeIgniter 4 Users Guide - Library Reference - Validation

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

What version of CodeIgniter are you running?
CodeIgniter 4 Users Guide - Library Reference - Validation

I use the 4.5.5 version. 

I think my validations are already followed as the documentation.

Try dd($this->validation) after check. See all errors . Maybe you reset validation in redirect.

Simple CI 4 project for beginners codeigniter-expenses ( topic )

Try dd($this->validation) after check. See all errors . Maybe you reset validation in redirect.

This is the result.

Dump and Die

I upload the pictures on my Google Drive.

Hi, I’m also working on file upload validations in CodeIgniter 4. I wanted to ask if the issue might be related to how validation data is passed during a redirect? Could storing errors in session()->setFlashdata() and displaying them in the view help solve this?