Got this email from Amazon Kindle Support:
Quote:
Dear Kindle Customer,
Thank you for using the Send to Kindle service. We are reaching out to let you know that the following document(s), sent to your Kindle at 10:11 PM on Mon, Apr 10, 2023 GMT, contains incompatible elements for Kindle format conversion. We’ve still delivered the document so that you can read it with Kindle, but in its current format it won’t support Kindle Scribe writing features (e.g., sticky notes or on-page writing).
* Prokofiev by Prokofiev (enhanced).pdf
Here are some helpful tips on how to make document(s) compatible with Send to Kindle’s Kindle format conversion:
Split large tables into several smaller tables, align the direction of text in the tables, and remove drop-caps in the tables.
Remove multi-media content such as audio, video, and SVG images.
Remove mathematical equations.
Remove images that contain linear gradients.
Remove password protection or any other security settings.
Remove any footnotes inside footnotes.
Check the document can be opened on a computer.
Make sure the document doesn’t have more than 8,000 pages.
Try sending the document again via drag and drop at www.amazon.com/sendtokindle.
To learn more about converting documents to a Kindle format, please visit our help page. By downloading or using Send to Kindle, you agree to the terms here.
Regards,
Amazon Kindle Support
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This appears to be for the most recent Send To Kindle I did with this, using the browser interface.
The missing features are the Writing toolbar, and it no longer will display progress and preview page with swipe up from bottom.
It might be the large TOC (number of PDF bookmarks) in this case; they're also hierarchical. I'll be trying some other things.