Org-Mode blows away Keep, unless you are using Keep on a stylus device like a Galaxy Note and use the pen to take notes. Org mode is made to manage a large or small number of files... even source code with TODO comments can be marshaled into an agenda. I'll toss a .org file in the top level of project and commit it in git... now I have a nice file with todos, deadlines and reference material. Since it's just text, it prints nicely and is very easy to manage.

As for media files, it's hyperlinks to media files.