Plugins for Calibre Integration. Finally annotations sync for epub, etc

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This is the message I get when I fail to import a book:

   GET https://192.168.165.20:8080/ajax/books/NCS net::ERR_SSL_PROTOCOL_ERROR

Fetch error: TypeError: Failed to fetch
at index.0336bf64.js:131:122
at index.0336bf64.js:140:499
at fn (index.0336bf64.js:1:70632)
at index.0336bf64.js:3:1