It's not possible for Sigil to keep unmanifested files. Unmanifested files are not supported by the epub spec. We could potentially special-case certain proprietary files, but I'm not really that inclined to help Apple ignore standard epub specifications. Plus I'm not a fan of any epub reading system that purposely chooses to modify the contents of an epub archive.
Neither of us are currently accepting any kind of compensation for our work on Sigil.
You might be able to find someone willing to write a python output plugin that could add the Apple artwork file to the epub, but we're not going to make it an inherent feature of Sigil.
Last edited by DiapDealer; 03-28-2021 at 11:16 AM.
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