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Originally Posted by Hollow Man
Does amazon also delete azw3 files? I only know of it happening with kfx/azw8 since I experienced it.
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There have been reports of azw3/KF8, KFX and mobi files being deleted. All that seems to be required is for the book to contain an ASIN matching an Amazon book that you don't own/have a loan of an Amazon copy and to keep your Kindle from connecting to Amazon for a long period.
In my testing, since I use the ISBN and ASIN for downloading metadata, my calibre generated Amazon format books had an ASIN. Since most of the books were sourced from Kobo, StandardEbooks, etc. in ePub format, I did not own an Amazon copy. When I took my Paperwhite 4 out of airplane mode after 5 or 6 weeks, most of the ebooks I had sideloaded vanished (according to the log files, they were deleted). Not a big deal to me since I only use the PW4 for testing ebooks I am formatting but for others where their Kindle is their prime ereader, an extremely annoying action.