Hello @Nurm ,
The screen comes up perfectly fine when I select the Google sync option in Edge, FF, and Chrome. You should see a small window appear as shown in the screencap below. Please check to make sure your browser doesn't have pop-ups blocked by any ad / pop-up blocking extensions or security programs.
Hello @Nurm. I wanted to check in and see if you were able to successfully use the Google integration to upload your contacts. Did you enable pop-ups in your browser?