Books delivered to the device by Amazon, either Amazon purchases or those you emailed or sent using "Send to Kindle", will automatically sync reading position, notes, and highlights back to your account. Any other Kindle devices or apps registered to your account will receive them automatically. I believe this is the simplest approach.
Added: One exception is that personal documents do not sync with Kindle for PC/Mac.
Last edited by jhowell; 08-23-2019 at 10:17 AM.
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