@astrodad, All I can tell you is that I use Kindle Previewer to compile/build my personal docs, then I use the Send To Kindle app to send them to the Kindle Cloud. I download them from the Kindle Cloud to my iOS/Android devices and they are capable of syncing highlights, notes, and bookmarks.
I am not sure if the format of the personal docs has to be KF8 before they will sync. I've never experimented. I think Kindle Previewer creates a dual KF8/Mobi7 file to be sent to the Cloud, but I could be mistaken.
How are you creating your personal docs?
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