Vimeo’s legacy widgets (Hubnut and Montage) are no longer supported because they aren’t mobile compatible. We plan to offer new and improved ways to embed playlists of videos in the future.
Until then, there are a variety of third party tools, such as Vimeo Wrap, that allow you to embed a set of videos. Although we did not build with this particular widget, it is a great alternative that can be jazzed up with additional plugins (all of which are available on the linked website).
To use Vimeo Wrap, all you need to do is grab the code from their site and swap out the URLs in the code they provide. You can choose either a series of video URLs, a Vimeo user URL (e.g., “https://vimeo.com/staff”), or a Vimeo collection URL (e.g., “https://vimeo.com/channels/staffpicks”). If you use a user URL or collection URL, it will play all the videos from the source, one after the other.