I have large folders I do not want to sync — from my computer to Dropbox — but when I right click, there is no option for "Do not sync". It appears sometimes when I re-install Dropbox or if I log out and login again, but it's temperamental and doesn't always appear....
Screenshot of my "right click" menu below.

This is so frustrating and I hope someone can help!!
What should I do? Thank you.