Uploading files with fileinput

I'm using fileinput of this site Bootstrap: fileinput.js v3.1.3 and I need to recover the BLOB of the image uploaded when submitting the form.

I noticed that when doing the uplod of some image the tag img appears and the BLOB is placed in it. As in the following image:

MyHTMLcodesareasfollows:

<divclass="col-sm-12">
 <div class="fileinput fileinput-new" data-provides="fileinput">
  <div class="fileinput-preview thumbnail" data-trigger="fileinput"><img class="img-responsive" src="{{$igreja->BLO_IMAGM_IGREJ}}" alt=""></div>
   <div>
    <span class="btn btn-info btn-file">
    <span class="fileinput-new">Selecionar foto</span>
    <input type="file" name="...">
    </span>
  <a href="#" class="btn btn-danger fileinput-exists" data-dismiss="fileinput">Remover</a>
  </div>
 </div>
</div>

  

I thought of doing the following, when uploading the file I set in a field with the property hidden the blob of the image up, so I can recover this data in my controller.

For the sake of curiosity I'm using Laravel 5.3 .