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Is by any chance your first real chapter bigger than 230kb in size?
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The biggest file is 112kb. The first file after the cover is 2kb.
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what are the particulars of your cover image? Format and dimensions?
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This particular file has a png cover with 1067x1600px and 2,31mb. But the same issue happens in over 20 different epubs with different sizes and file formats (png and jpeg).
On the other hand, I have hundreds of working files with bigger resolution and file size.