I want to add a title picture to my map, so that in the gallery I can see the picture, not part of the map.
I do this by making an image with a powerpoint slide. After that it is just like making a thumbnail for a map were I do a screen-capture with Paint. Then I resize the image to a thumbnail and upload it just I like I would a thumbnail of map (go to map item details >edit>click the text under the image).