I gather there's no software that can just take my EPUB2 file and just "instantly convert" it to 3? I looked around, but all I could find was tutorials on how to convert it in the code, "manually" (which is a pain, especially if/when I might make changes/corrections down the road -- which is quite possible).
And aren't there compatibility issues with EPUB3, that many readers (especially older readers) can't view those?
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