CardDav Contacts sync
I am looking for some kind of integration to sync my Fastmail contacts (accessible through carddav). Currently when I export contacts from Fastmail as Outlook Express contacts and then import into Insightly with Import action set to "Update Existing Records" it doesn't actually update existing contacts. Instead, it skips duplicated contacts while my expectation was that it should update them.
I found that Insightly has Google Contacts sync in Premium Plan. But I don't use Google for storing my contacts.
Is there any way to synchronize or properly import contacts from Fastmail or CardDav accounts?