Apparently I have lost the Dropbox context menu in Nautilus when I'm browsing my Dropbox folder. The context menu where I can get the file URL and Manage the files. I still have the Dropbox context menu to send file to my Dropbox folder from any other folders though.
Nautilus Version 3.36.3-stable
Dropbox daemon version : 114.4.426
Dropbox command-line interface version : 2020.03.04