{!! Form::open([
    'method' => 'PUT',
    'action' => 'Auth\ProfileController@putAvatar',
    'files'  => true
]) !!}

    <div class="modal fade" id="change-avatar-modal">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-body">
                    <div class="form-group">
                        {!! Form::label('avatar', 'Archivo')!!}
                        {!! Form::file('avatar', ['accept' => 'image/*']) !!}
                    </div>
                </div>
                <div class="modal-footer">
                    <button class="btn btn-default" data-dismiss="modal" type="button">Cancelar</button>
                    <button class="btn btn-primary" type="submit">Enviar</button>
                </div>
            </div>
        </div>
        
    </div>
{!! Form::close() !!}