Topic: Updating CarrierWave files (text), how do you do it?

I'm currently using CarrierWave (https://github.com/jnicklas/carrierwave) for a project.  CarrierWave is uploading text documents.  In my application the user is shown a list of text files they have uploaded.  The content of these files can be loaded into an html textarea and edited.

My question is this:
How would I go about updating the CarrierWave file once it has been edited in the textarea?