In a manner similar to how Squib deals with the different file types (.textile, .markdown, .opml) in the sidebar --
Squib should also be able to render and upload files with similar extensions.

I see this as a separate folder similar to /static. Where the file, for example an OPML file, is dropped into this folder,
or a subfolder, and it is run through the appropriate rendering process using the current template and then uploaded.

This would be similar to Radio's stories.

Things to consider. The user might want to place both rendered and non-rendered files within the same server-side folder.
So /static/test/image1.jpg, /static/test/image2.jpg, and /stories/test/images.markdown would create one rendered file
in the ../test folder and store 2 images there.