The release notes for the new 3.73 version of Amazon's Kindle Previewer has this statement:
It is unclear whether support for AZK is to also going be removed from the iOS app since the method for creating it is going away.
This is unlikely to impact very many people. I suspect that sideloading AZK format to the Kindle for iOS app is seldom done these days.
Quote:
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Exports in the .azk file format will no longer be available as of October 16, 2023 in Kindle Previewer Version 3.74. We recommend the Phone and Tablet device type preview options for the best representation of Enhanced Typesetting on iOS devices. |
This is unlikely to impact very many people. I suspect that sideloading AZK format to the Kindle for iOS app is seldom done these days.