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I followed the instructions here, to allow for annotations on kindle scribe:
Scribe users can only write directly on pages if the book is in the Print Replica variant of KFX format. Colorsoft Kindles do not display PDF files in color but will show color if the file is converted to Print Replica KFX. That format is normally produced when sending a PDF though Amazon's send-to-kindle service for delivery to those device types.
To generate that format for sideloading you need to import a document in PDF format into Amazon's Kindle Create software. Choose Create New and select Print Replica as the format. After importing the PDF file chose Edit, Preserve Links in order to keep as much functionality of the original PDF as possible. Use the Publish option to produce a KPF file and then convert that to KFX using the plugin's command line interface.
For example, if the KPF file is named my book.kpf it can be converted to KFX using the following command:
Code:
calibre-debug -r "KFX Output" -- "my book.kpf"
Print Replica KFX format is only supported on Scribe and Colorsoft devices, not on regular Kindles. Despite being unsupported it appears to display properly on newer Kindle models running the latest firmware but not on older ones.
Exporting annotations made to side loaded Print Replica KFX will probably not be possible via email. Hand drawn annotations are stored on the Scribe as hidden notebooks. Those can be extracted from the Scribe and then converted to EPUB format containing SVG images by using the KFX Input plugin, however the EPUB will only contain the annotations and not the underlying PDF page backgrounds.
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