What to do if Share options are missing?
Many users said after they updated to macOS Sierra 10.12, AirDrop and some other options can’t be seen sometimes. Fortunately someone has found a solution, which was tested to be effective.
If your Mac device encountered the said problem after the system was upgraded to Yosemite El Capitan, try the following solution:
1. Open the Terminal app, which is in the Utilities folder of your Applications folder.
2. Type this command in Terminal:
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -seed
3. Press Return and wait for the Terminal prompt – which ends in $ – to reappear. It may take a few minutes.
4. Quit Terminal.
Then you should see the previously missing options, such as AirDrop, Email and Share on Facebook, etc. If not, go to Apple menu > System Preferences, click Extensions, and make sure that the Markup and sharing features are turned on in the Actions and Share Menu sections.