Rather than giving a limited list of keywords to choose from when uploading content, why not allow the user to submit a list of their own keywords.

I recently uploaded some content but was only able to allocate three keyword from the list supplied as none of the others related to the video.

The result is that viewers that would be interested in my video will probably never find it as they will enter search terms that are not allocated as keywords to my video.

Users providing their own keywords that really relate to the content being uploaded seems so obvious and sensible.

Please can you look into this flaw in your system.