What version are you running?
3.0.8
What's the URL of the page this enhancement relates to, if any?
/r/reviewId/diff/pageNumber/
Describe the enhancement and the motivation for it.
It would be nice if I could reorder the files in my review prior to sending it out, so that all files are in a logical order, and the reviewer doesn't need to scroll between files as often.  For example, I could start the review with model objects and interfaces, and end it with the concrete implementations that use those objects and interfaces.
What operating system are you using? What browser?
Fedora27/Chrome
Please provide any additional information below.