I have a shortcut to my Dropbox folder on my dock. Occasionally, a file called "Icon?" will appear when I click on the Dropbox folder on my dock, as shown below.
Does anyone know why this file keeps appearing, and how to stop it from appearing again? I've tried deleting it, and it disappears for a while, but then eventually it comes back again. When I try opening the file, it just leads to a blank file in TextEdit. When I try to look directly in my Dropbox folder, by opening it directly in Finder, the file is nowhere to be found either.
If it helps, I am on the latest version of Sierra, on a mid-2012 rMBP.