In order to fix the facebook reel not loading issue, you need to follow the given below steps. Before that, you need to check the status of facebook and you can check this on downdetector website, so do this first and later follow these steps.
1. Close and re-open the app
2. Clear the cache files of the app
3. Logout and login to facebook again
4. Use an excellent internet connection
5. Update your to its latest version
Source: https://getassist.net/facebook-reels-not-showing/
Steps to Fix Facebook Reel Not Loading?
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