I have uploaded a pdf file and it's not showing on website when click on pdf link

I have uploaded the pdf link on website and when clicked on link it's not showing pdf file.

view

<div class="entry-content">

   <a  target="_blank" href=""><p style="font- 
      size: 
      18px;color: #468b10;">   </p>
   </a>

</div>

controller

      public function show($id)

    {

        $file=Post::find($id);

        $content = base64_decode($file->content);

        return response($content)->header('Content-Type', $file->file);
}

public function store(Request $request) {

if (request('file'))

{

        $file = request('file');

        $file_name = time() . $file->getClientOriginalName();

        $file->move('uploads/posts', $file_name);

        $data['file'] = 'uploads/posts/'.$file_name;

    }

}

via Chebli Mohamed