Update 5.16.3 includes this Scribe-only 'feature':
Quote:
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Connect Kindle Scribe over USB using Media Transfer Protocol (MTP) instead of emulating a disk drive.
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Connecting via USB no longer shows as a USB Drive (removable volume in Finder, a drive volume in Windows Explorer). As it is not mounted in file system, there is no access via command line. Mac requires third party MTP client like Android File Transfer to manage content. Another inconvenience is that only one MTP client can connect at a time. I don't know if this is also true on Windows. It also causes issues on Linux but I don't have one set up to be able to describe what these are.
Disconnect is done by tapping Disconnect on the Scribe.
Calibre evidently knows MTP, so it still connects and shows content, is able to Send to device, etc.
However, calibre
Show books now displays items which are normally filtered out (by calibre?) or hidden with '.' filename prefix on an emulated FAT32 partition. (see screenshot). Matching to In Library does not always work correctly because of this (see '.Anna Karenina'). Also some .kfx content inside of .sdr folders, html files in /System folder, readme in /fonts folder etc..
Of course undocumented
ebook-device command line tool does not work with Scribe.
Kindle 10th and 11th generation also got this update, but still mount to file system as before. Without knowing Amazon's motivation for making this change, it seems as likely as not that they might get this 'feature' in the future.
So some sort of fix is needed for Scribe. I will be happy to provide more information if any is needed. Thanks.