Laravel Image Update

I'm doing a Admin Panel in Laravel 5.6 , I have a problem where productController --resource update.

My store as this;

if($request->hasfile('filename'))
        {
        $file = $request->file('filename');        
        $name=$file->getClientOriginalName();        
        $image_resize = Image::make($file->getRealPath());              
        $image_resize->resize(590, 590);
        $image_resize->save(public_path('/images/urunler/' .$name));
        } 
        $urun = new Urun();
        $urun->k_id=$request->get('k_id'); 
        $urun->ad=$request->get('ad'); 
        $urun->form=$request->get('form');
        $urun->icerik=$request->get('icerik');                
        $urun->ticari_sekli=$request->get('ticari_sekli');
        $urun->filename=$name;
        $urun->save(); 

        return redirect('/urunler')->with('success','Ürün Başarı İle Eklendi.');

and My Update as this

$urun= Urun::findOrFail($id);  
    $urun->update($request->all());

    if ($request->hasFile('filename'))
    {
        $file = $request->file('filename');        
        $name=$file->getClientOriginalName();        
        $img = Image::make($file->getRealPath());              
        $img->resize(590, 590);                                                                         
        $img = Image::make($file->getRealPath())->resize(590, 590)->insert(public_path('/images/urunler/' .$name));                                                 
        $img->save(public_path('/images/urunler/' .$name));   
        $urun->image = $name;                        
    }   
    $urun->save();
    return redirect('/urunler')->with('success','Ürün Başarı İle Güncellendi.');

Store part is working but Update part save a filename database but image doesn't move in images/urunler

My php version is 7.2.4 and I'm using Laravel 5.6

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