If your iPhone 11 is not loading photos and videos on apps like Facebook, Instagram, Snapchat, etc., there could be a few potential reasons. One possibility is a poor internet connection, despite having good WiFi and signal strength. Another factor could be a software problem with the iOS or app itself. To resolve this issue, you can try restarting your iPhone, clearing the cache of the troublesome app, updating your iOS and apps, and checking if there are any network settings that may be causing the problem.