You can simply drag and drop one or more images in to the topic screen.
Or, click on the add visual (+) button in the topic screen. Select a file or take a photo (for mobile). When adding visuals through the (+) button, you have to enter an image title. Furthermore you can add a description, assign tags and rotate your visual. Finish by clicking ‘save’. Visuals are automatically stored by date, time and author, but can be rearranged by dragging them in order in the ‘edit topic’ screen.