If you are unable to see uploaded images on your selected banner campaign, determine if the image you are uploading is within the dimensions set for each zone.
Zone 1 (Above Search Results) - Min Width: 10, Max Width: 1200
Zone 2 (Above Navigation) - Min Width: 10, Max Width: 250
Zone 3 (Under Navigation) - Min Width: 10, Max Width: 250
Zone 4 (Below Search Results) - Min Width: 100, Max Width: 1200
Zone 5 (Below Search Results & Zone 4) - Min Width:100, Max Width: 1200