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Nothing. Now you know that things are working correctly because that's how you batch load multiple songs. To get both pages at once you will need to get a pdf merging program like PDF Creator [I think that's the one I use]. Once the 2 pages are in one pdf file, with a unique name, you can put it in the same folder and do a batch load. As long as you checked 'no duplicates' in the batch preferences, just the new file will upload.
You could use them that way, 2 separate pages, but it will be clumsy, don't ask how I know.