The best way is to create a slideshow within your BE Hub group.
This can be done by an administrator in the group by doing the following:
Click on MANAGE
Choose Overview Page from the drop down menu
You will see a blue box appear. Within the box, you will have the option to choose Layout and Widgets.
Under the Widgets, Choose Other
Then Choose Slideshow Carousel
Click on the Green box and drag the widget down to where you would like it.
Within the widget box, click on the arrow, located in the upper right-hand corner of the box. Choose Edit widget.
This will provide prompts of what to do.
You can upload up to 20 pictures in a given slideshow carousel.