When you first set up your Space, you should create a welcome video welcoming your members to your Space. When you invite members to your Space, this video becomes the first video they see when they join.
You can also do a screen recording which shows members how to use the Space, where you’d like them to post, view and where they can create private groups or direct messages.
Where Do I Create a Welcome Video?
Welcome videos are created in Start Here. By default these videos will be view only which means members cannot create their own or reply to your post.