I have uploaded a pdf file and when try to open it on my website it's showing file not found

Question

I am trying to open a pdf file when I click on my website. The PDF is uploaded from the admin, but it's showing not found 404

view

 <div class="entry-content">
   <a target="_blank" href="{{$post->file}}">
      <p style="font-size: 18px;color: #468b10;"> 
         {{ $post->content }}
      </p>
    </a>
  </div>

Controller

   if (request('file')) {
       $file = request('file');
       $file=$file_name::get($file);
       $file_name = time() . $file->getClientOriginalName();
       $file->move('uploads/posts', $file_name);
       $data['file'] = 'uploads/posts/'.$file_name;
    }