I was wondering if its possible to upload a storymap on the GIS Online cloud? Also, is it possible to make the storymap private, that is, viewable by only those that are part of the group?
Some Storymaps templates are available as hosted application in ArcGIS Online, you can use them by sharing your webmap through the viewer (see that blog post for the procedure).
More and more of our template are going to be available in ArcGIS Online. From now, the remaining of Storymaps template have to be downloaded and deployed on your own web server (can be a free service like Dropbox). It is not possible to use ArcGIS Online to host those templates. If you are hosting the application on your own server, it is possible to create an ArcGIS Online item that link to your application, that way you can share the link with your user.
ArcGIS Online Organizational account allows to share an hosted application with a group. It is not possible to do so with the free public account (application is either public or private).
