You cannot get the highlights into the PB app via Dropbox. AFAIK only Kindle offers genuine highlight synchronisation.
I use Coolreader on my Pocketbooks. It creates a TXT file for each book with the highlights. I sync the folder with those files to Dropbox. It's not possible, though, to integrate these into a book on another device. For me it's enough to have the highlights in separate files.
I think the Onyx devices are running on Android 6, or was it the Likebooks?
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