Quote:
Originally Posted by Hopkins
Converted to mobi format via Kindle Previewer 3
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It displays vertically on the Kindle.
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The Kindle Previewer uses kindlegen to create a Master MOBI file. It contains the old MOBI-7 format along with the newer KF8 (azw3) format in the same file. (Notice the relatively large file size.) KF8 supports vertical text and MOBI-7 does not.
Your device is using the KF8 format from the file. An older Kindle will not do that.