Facebook Debugger - Update Photo that is Posting to Facebook
If Facebook doesn't seem to be posting the most recent text and image you added to your project, you will want to follow these
Facebook will memorize whatever was initially shared by your page. Even if you update the image, it will still post what was initially shared. But don't fret, there is an easy solution.
Copy your project's URL
Click here -> https://developers.facebook.com/tools/debug/og/object/
Paste your Campaign's URL in the debugger and click the 'Fetch new scrape information' then click 'Show existing scrape information
That should do it! Now when you click to view your live page and share to Facebook, your updated sharing details should post like a charm! Happy sharing!;-)