At the moment with Android there’s no built-in method to refresh the media library. To do this after adding music, videos or pictures to your Android device, simply use the application SDrescan. You’ll find this on the Android Market and it’s completely free.
What SDrescan does is rescans for new or removed media files. Simple but effective.
Google play: https://play.google.com/store/apps/details?id=com.bero.sdrescan
Having problems with a local storage error when trying to play flash videos on YouTube or other websites?
If you’ve reinstalled Flash Player but still have the same error, then try removing the website from the Website Storage Settings Panel, which can be found here: http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html
Note that the manager just underneath the title of “Website Storage Settings Panel” isn’t an image, it’s the flash application you’ll use to remove the website. Simply choose the website you’re having problems with, then delete it and try watching your video.