Ah, looks like this has been covered here:
I had the same issue for months on Ubuntu 16.04. I’m running version
18.104.22.168367-xenial. What worked for me was:
insync quit insync start
Seems like an insync bug as tray icons were deprecated. Please make the default .desktop action be show. While making show start insync if not started. Seems like an easy fix.
Part of the reason I use fedora is I won’t have a million icons cluttering my visual space, unlike MacOS
Same problem on ubuntu 16.04