ePub export and iOS

[kour1er]

When I try and export some articles to ePub, the export appears to work, but when I attempt to import to iBooks on iOS (either iPhone or iPad) or macOS, it won't import the book. This is using version 2.3.2 of Wallabag and the most recent iOS hardware and OS versions.

If I try and open the same ePub in Calibre (on the Mac) it does work. So it appears to be some incompatibility with iOS/iBooks?

[j0k3r]

Any error reported from your iOS device about what could be wrong in the epub?
Otherwise, it'll be almost impossible to fix on our side 😕

[kour1er]

I go to import the file (via AirDrop) and no errors are reported and the ePub just doesn't appear. On the Mac I see these lines which might be of interest in the system log:

default 14:59:16.250387 +0100 iBooks /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleFSCompression/AppleFSCompression-96.30.2/Common/ChunkCompression.cpp:50: Error: unsupported compressor 5
error 14:59:16.254373 +0100 iBooks Could not create FPSandboxingURLWrapper with url: , error:

Also, I ran the ePub through a validator (http://validator.idpf.org) and it reported some errors in the file:

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FATAL	./tmp/uploads/1527602834622_0000020776/inputFile/Unread articles.epub/Unread articles.epub	-	-	Corrupted EPUB ZIP header.
WARNING	./tmp/uploads/1527602834622_0000020776/inputFile/Unread articles.epub/OEBPS/book.opf	25	78	XHTML Content Document file name 'OEBPS/Title.html' should have the extension '.xhtml'.
WARNING	./tmp/uploads/1527602834622_0000020776/inputFile/Unread articles.epub/OEBPS/book.opf	26	131	XHTML Content Document file name 'OEBPS/Ulysses13BringsUpgradestoWritingGoalsKeywordsandCodeBlocks.html' should have the extension '.xhtml'.

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This is from a fresh install of Wallabag so I'm not sure if I've messed something up or if it is iBooks on Apple platforms being particularly picky about which ePubs it will accept?

Thanks for any thoughts on this.