I couldn't find this either so I had to email them and ask. You've probably figured it out by now, but in case someone else needs the info:
"Hello,
Synchronization is available in the latest versions of ReadEra Premium. To enable synchronization, install the latest version of ReadEra Premium and add a Google Drive account in the app settings on each of the devices you want to sync.
Let us know if you have any further questions. Thank you.
Best regards,
ReadEra team"
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