My Kindle is permanently in airplane mode since a few months back, and I sideload all books. Mostly because I like organizing my library on my computer, but also because when I have tried syncing to get my periodicals, some books have disappeared while syncing! These are sideloaded books, and it is always the same around 30books that disappear off my Kindle Oasis 2 when I test syncing. Very strange. Some are purchased from Amazon, some Gutenberg books and some bought in other formats and converted.
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