Select "Media Library" to add your uploaded images or videos. Click "Own content" to get to the file you wish to add or use the search bar to find the file name. You can switch between folders by clicking the folder symbols.
You can drag the content directly to the content list of the playlist by holding the mouse button down. Otherwise you can select several files and drag them into the playlist together.
Click the button with the check marks above the list to save the playlist changes.
Add a website to the playlist: Drag the website-image via Drag & Drop to your playlist. A pop-up window will open which allows you to insert your desired URL (i.e.: www.viewneo.com). Finally, click "Save" to add the website to the playlist.