an alternative to USB is: add the 58Mb file to a "documents" folder in your amazon cloud drive ( no file size limits there); access that from your Kindle ( with a fire tablet you'd just use the documents tab, with a PW I guess you'd use the built in browser to download it, unless it also has cloud documents access ii-built)
Where are your existing highlight being stored - did you highlight the epub or the mobi version, and how ?
there is a desktop app for putting stuff into your cloud drive, or you can do it via any browser.
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