Amazon does not want you reading side loaded books on your devices. They want all your books to come from them or at least live in their cloud.
Over the years they have been gradually and consistently disabling functionality for side-loaded books. They do it slowly and subtly hoping that people wont notice. I for one am tired of finding workarounds for their malice or their incompetence. If you do figure it out let us know, and I'll be happy to make the change (provided it does not break something else).
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