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The application works as was implemented by the developer, the said features do not work when the "low data mode " option is set to on in the settings. Viewing Facebook in its basic mode does not support those features. To allow for this features,

1. go to settings,
2. scroll down till you reach the general header
3. Uncheck the "low data mode" option
4. Go back to the homepage
5. Now click on the plus sign to access the functions you listed.
6. Click on post status or any other. You'll see that it works.