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I've just overcome this problem. It took their technical team to give me the answer. Apparently, after trying all kinds of formats, using different computers it was, unexpectedly, the cover that was causing the problem - go figure! It said it had been uploaded successfully, and it was in the required format. But I reloaded it as instructed and hey-presto - the main file then uploaded!
So something weird at their end.
Maybe it'll work a try for you.
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