{!! Form::hidden('user_id', Auth::user()->id, ['class' => 'form-control']) !!}
<div class="col-md-4">
    <div class="form-group {{ $errors->has('imagem') ? 'has-error' : ''}}">
        {!! Form::label('arquivo', 'Arquivo') !!}
        <div class="fileinput fileinput-new" data-provides="fileinput">
            <div class="input-group input-large">
                <div class="form-control uneditable-input input-fixed input-medium" data-trigger="fileinput">
                    <i class="fa fa-file fileinput-exists"></i>&nbsp;
                    <span class="fileinput-filename"> </span>
                </div>
                <span class="input-group-addon btn btn-file">
                    <span class="fileinput-new"> Selecione um Arquivo</span>
                    <span class="fileinput-exists"> Mudar </span>
                    {!! Form::file('arquivo') !!}
                </span>
                <a href="javascript:;" class="input-group-addon btn red fileinput-exists" data-dismiss="fileinput"> Remover </a>
            </div>                                        
        </div>
        {!! $errors->first('arquivo', '<p class="help-block">:message</p>') !!}
    </div>
</div>