Moreover, using send to kindle instead of side loading will conserve storage on your Kindle. O'Reilly mobi files are 'hybrid', i.e. they contain both kf8 and mobi, so they are roughly twice as large. Personal document service delivers only the format that your device can understand, so where a Paperwhite will get kf8, Kindle for iPad would get mobi.
Calibre can handle this also but it is not as convenient.
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