can't upload file when edit user

hello, i want to edit user profile picture. i've success upload foto in register form, but when i edit user from edit form image won't upload to server(public/uploads).

this is create method :

public function store(CreateDosenRequest $request)
{
    $user = User::create([
        'name'     => $request->input('name'),
        'username' => $request->input('username'),
        'email'    => $request->input('email'),
        'password' => $request->input('password'),
        'admin'    => $request->input('admin'),
    ]);
    if (Input::hasFile('image')) {
        $data        = Input::file('image');
        $photo       = Input::file('image')->getClientOriginalName();
        $destination = public_path() . '/uploads/';
        Request::file('image')->move($destination, $photo);
        $data = $photo;
    }

    $dosen = Dosen::create([
        'iddosen'           => $request->input('iddosen'),
        'nipy'              => $request->input('nipy'),
        'namadosen'         => $user->name,
        'user_id'           => $user->id,
        'alamatdosen'       => $request->input('alamatdosen'),
        'notelpdosen'       => $request->input('notelpdosen'),
        'tempatlahirdosen'  => $request->input('tempatlahirdosen'),
        'tanggallahirdosen' => $request->input('tanggallahirdosen'),
        'agamadosen'        => $request->input('agamadosen'),
        'fotodosen'         => $data, //you have to add it hear

    ]);

    return redirect('admin/dosen')->with('message', 'Data berhasil ditambahkan!');

}

edit form method :

public function update(Request $request, $id)

    {


        if (Input::hasFile('fotodosen')) {
        $data        = Input::file('fotodosen');
        $photo       = Input::file('fotodosen')->getClientOriginalName();
        $destination = public_path() . '/uploads/';
        Request::file('fotodosen')->move($destination, $photo);
        $data['fotodosen'] = $photo;
    }
        $dosenUpdate = Request::only(['nipy', 'namadosen', 'alamatdosen', 'notelpdosen', 'tempatlahirdosen', 'tanggallahirdosen', 'statusdosen', 'fotodosen']);
        $user = User::find($id);
        $user->dosen()->update($dosenUpdate);
        if(Auth::user()->admin==1) {
            return redirect('/admin/dosen')->with('message', 'Data berhasil diubah!');
        }

        return redirect('/dosen')->with('message', 'Data berhasil diubah!');


    }

edit view :

<form class="form-horizontal" method="post" action="{{ url('/admin/dosen') }}" enctype="multipart/form-data">
                                <div class="form-group">
                                <label for="photo">Upload Photo</label>
                            
                                    <input type="file" name="fotodosen" class="form-control">
                                
                         </div>

                                {{ Form::button('<i class="fa fa-check-square-o"></i> Simpan', ['type' => 'submit', 'class' => 'btn btn-primary'] )  }}
                                <a class="btn btn-small btn-success" href="{{ URL('dosen/') }}"><i class="fa fa-reply"></i> Kembali</a>

                            {!! Form::close() !!}
                            </form>

what am i missing?