title_body: Syncing kindle book annotations (non Amazon books) across kindle apps I buy Kindle Manning + O'Reilly books as they tend to be cheaper than the ones on Amazon. Can I sync annotations (e.g. notes, highlights) between Kindle apps (PC, tablet, etc.) ?
upvoted_answer: Amazon Support said (on 2019-05-24) that syncing personal documents is not supported.
  
  Here is my chat:
  
  ► Amazon: I'm sorry, currently there is no option to see the highlights made in the personal documents.
  
  ► Me: Ok, you are saying that Amazon deleted the website that allowed viewing highlights made in personal documents. Then I still have the other 2 questions:
  1) Should Whispersync work to keep my reading "location" up to date between devices when reading personal documents (or is that not supported anymore either)?
  
  2) Should Whispersync work to keep my highlights identical between devices when reading personal documents (or is that not supported anymore either)?
  
  ► Amazon: I can understand your concern. Please allow me a moment to check this.
  Thanks for waiting.
  I'm sorry, the highlights will not sync through all the devices which are made on personal documents.
  
  ► Me: And I guess the current reading "location" / progress won't either?
  
  ► Amazon: Yes, exactly.