Inside the Event Hub you can add a caption to a photo.
Add a Caption to a Photo in the Event Timeline
(a) To add a caption to an image, open the image in the Media Viewer by clicking it’s thumbnail.
(b) Once the image is open in the Media Viewer click the Caption icon in the bottom left corner of the Media Viewer.
(c) This will open a text box panel on your screen. Type in your caption and click ‘Save Caption’.
(d) This will add a caption to the photo that is visible from the Media Viewer.