If you can’t upload photos from your iPhone to Facebook, and each time you try get the message “This app does not have access to your photos or videos”, then follow the steps below to get this sorted!
1] Go to the main settings for your iPhone (not the settings in the Facebook App).
2] Choose the Privacy icon (picture of hand, white on grey).
3] Click Photos.
4] Slide the slider next to Facebook to ON.
That’s it! Easy when you know how!