Disclaimer: This workaround may NOT work well for some users and they may experience data discrepancies because the data is indirectly synced from Polar Flow to BookDoc via another third-party app, Apple Health.
– Download the ‘Polar Flow’ app and create a user account.
– Pair your Polar device to the ‘Polar Flow’ app.
– Open the menu in the top left corner, and then go to General Settings.
– Toggle Apple Health on.
– Toggle ‘ON’ for all categories.
– Open the BookDoc app and tap on ‘Activ’ to sync with Apple Health.
– Please open both the ‘Polar Flow’ and ‘Apple Health’ apps once daily for data transmission.