Activate Finder Sync Extension
If not context menu and/or sync overlay icons appear.
Step by step
Check whether the Extension is activated
Open the System Preferences
Open the Finder and open
/Applications/System PreferencesPress
CMD + Spaceto open Spotlite and type "System preferences" and hitEnter
Click on the icon named "Extensions"
Select "Finder" in the list on the left
Make sure the checkbox in front of "Liferay Nativity Finder Integration" is checked