Brokerage (Trading 212) sync with Snowball

Has anyone got this to work as an actual sync rather than having to do an export /import from 'History'? I believe it was in beta a while ago but just tried and get an error when i try and actually sync it.

Same but separate question - If you import data from T212 to Snowball for a perido that is already in there, does it overwrite or duplicate the data. Need ot swork out how carefull I am with imports

Any help / guidance appreciated