Playlists are saved using the browser's cookie function, so if you change the browser or delete the cookie from the settings, it will disappear. If the number of items is too large, the browser may become heavy, so please use about 100 items as a guideline.
No videos have been added to the playlist.
Create your own playlist by pressing the "ADD TO PLAYLIST" or "REMOVE FROM PLAYLIST" button on the video playback page.