How do I unhide a photo I was tagged in on Facebook?

If you are scrolling through your notifications, tap the square preview of the photo on the right side of the screen. Press the three dots in the top right. This will open up a menu with several different options for that post. Alternatively, you can tap your tag in the photo, then select Show On My Profile.

With Facebook privacy settings, you control the visibility of the content you post on Facebook. If your friends are unable to view your tagged Facebook photos, it is likely that you've adjusted your privacy settings to prevent them from doing so.