Please check youtube URL for this app:
Gallery will then pickup new images, videos etc., this also removes any stale thumbnails.
With this app you can refresh the media any time you want with the click of a button.
Simple handy tool to keep thumbnails in sync with what is there on the sdcard.
Images, pictures of any supported format png, jpg, gif etc.,
Videos mp4, mov etc.,
Music mp3 and other supported formats
Force refresh gallerry thumbnails any time and rescan the media.