Does iBooks actually store its notes and hilights inside the epub? If so, there's a good chance that unmanifested, non-spec-compliant files of any kind won't survive a Sigil save/reopen.
Without knowing how iBooks handles it's notes and hilights feature, it's going to be hard for us to see if there might be a workaround/solution.
Last edited by DiapDealer; 05-14-2018 at 08:32 PM.
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