First of all, I use owl as a demo-database for our band. I basically store MP3-files. I'm really glad I found OWL, because it makes no big deal between the media-files, but an extended audio-preview would be nice.
That works for me, but if your 'Documents' folder ist outside the DocumentRoot it would probably not. For security reasons I thought about a temporary copy of the file...
There are some nice options, but I don't know if its necessary for the target group of OWL.