Thanks. Everything works fine on PB626, Oppo A57 (CPH2387) and Samsung Galaxy A6 (2016). Sometimes statistics get messed up after synchronizing too early, that is before PB626 had acquired the correct date. Deleting the statistics.sqlite3 in Dropbox and synchronizing again is sufficient to get things working again.
Synchronizing reading stats fails in Koreader in Windows Subsystem for Android although syncing reading position through Koreader server is working fine here too. Remarkable that tablet and smartphone offer to synchronize to with other devices inmediately after starting Koreader and PB626 doesn't
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