Something like this:
Pictures get indexed after camera app is closed, the same with videos.
Inside media player there should be a button to chose "Auto Indexing" (index always one) or "Manual Indexing".
When Manual Indexing is chosen you get another button that says "Scan for new media", that triggers the Tracker to index new music and videos. It works that way on Symbian S60 3rd if I dont remember wrong.