The latest firmware for the ZF is available here https://downloadcenter.nikonimglib.com/en/download/fw/545.html
Fixes: Fixed an issue that sometimes caused overexposure in the viewfinder and monitor shooting displays (live view) when the standby timer had expired then reactivated.
Open the image with the expand arrows and click on add comment.
This is what it looks like on mobile version. Should be same on desktop. See image below.
Also, if you are on Desktop, when you click on the i for info popup box, there should be a Comment button as well. only on Desktop version.
Just HOW do we COMMENT to an image now? Cannot find the "comment"-button anymore ...?
Walter