I have a document that I've sent to my Kindle account. I want to record highlights as I read it. If I read it on my Kindle Oasis, the highlights are stored on that device, but not synced to my other devices. If I read it on my iPhone or iPad, then the highlights sync to each other - iPad to iPhone and vice versa - but not to the Oasis.
I've tried deleting the document from the Oasis and re-downloading it; I've even reset the Oasis entirely. But it still doesn't work.
This wouldn't bother me too much, but the notes are no longer available on the Amazon website for documents; I only see notes on purchased books there.