trying to insert images to items in listview

I want to show music items to user with thumbnail image and title of music but it doesn't work as I intended. I have same code with different list and it worked there, but somehow it doesn't work on this code.

code doesn't work:

            form1.playlist_music_list.Items.Clear();            form1.playlist_music_list.Columns.Add(" ", 400);            form1.playlist_music_list.View = View.Details;            ImageList thumbnailImageList = new ImageList();            thumbnailImageList.ImageSize = new Size(180, 101);            foreach (var musicItem in musicitemstoadd)            {                thumbnailImageList.Images.Add(musicItem.Image);                ListViewItem item = new ListViewItem(musicItem.Title);                item.ImageIndex = thumbnailImageList.Images.Count-1;                item.Tag = musicItem.VideoId;                form1.playlist_music_list.Items.Add(item);            }

(there is no problem with musicitemstoadd and image. (added musicitemstoadd as a parameter for working method below. ex) internal_playlist(musicitemstoadd, video_id))(Also checked if images are properly added by using picturebox, and it showed well)

code that works:

    internal async void internal_playlist(List<Playlist_Music_Items> playlist, String sel_videoid)    {        form1.Inplay_playlist.Clear();        form1.Inplay_playlist.Columns.Add(" ",400);        form1.Inplay_playlist.View = View.Details;        ImageList thumbnailImageList = new ImageList();        thumbnailImageList.ImageSize = new Size(180, 101);        foreach (var musicItem in playlist)        {            thumbnailImageList.Images.Add(musicItem.Image);            ListViewItem item = new ListViewItem(musicItem.Title);            item.ImageIndex = thumbnailImageList.Images.Count - 1;             form1.Inplay_playlist.Items.Add(item);        }        form1.Inplay_playlist.SmallImageList = thumbnailImageList;    }

I've checked all component(title, image, id, etc) working well. But it shows only title, not the image as I expected to be.