Why my YouTube Gallery doesn't update?
Please don’t worry if your YouTube Gallery plugin doesn’t instantly display new videos from your YouTube source.
The reason this happens is that our plugin uses cache to make it load faster and to reduce the load on the server. The way it works, the plugin doesn’t request YouTube each time your page is opened or reloaded. Instead, it requests YouTube once in 24 hours, pulls in the videos from your source channel, stores them in the cache, and displays them from the cache.
After the cache is expired, the widget requests YouTube for the videos again, and that’s when the updates make it to your gallery. So your videos will display no later than in 24 hours.