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Solution: Push "edit game." Go to the "upload" page.
At first you will notice that the size category is gone. Fear not! re enter your index file. As soon as you pick the file, the size category will magically appear right underneath. It's right there on the same screen.
Put in the correct size, finish the edit process, and Kong will resize it appropriately. Even the though new files are duplicates of the old ones, it may take a couple minutes to fully upload.