• Select the news item
• Press the 'Add Picture' button

• To add one picture "Click" the picture which will be highlighted in red and Save.
• To add multiple pictures "Double Click" the first picture until it goes red and then click other pictures required, each should remain red. When you have selected all pictures required, press Save.
• Once Saved with multiple pictures, the View Item page will include an option to determine how the pictures are to be displayed: thumbnails, scrolling, sliding

You can also use a Video in your news item. Ideally, you should include only one Video file per news item and not mix it with pictures. Add the Video file, using either method 1 or 3 above. Currently, it's not possible to use Video files within the editor.