I have that rare thing, a group of contributors who worry too much about copyright. To encourage them to use the media library, I want to provide them with an alternative version of the library that only shows licensed images. I label these with an attachment category, 'Licensed Stock Images'.
I thought I could make a copy of
upload.php that's already filtered by
Att. Category = Licensed Stock Images but couldn't work out how to pre-set the filter. I also wondered whether there's a URI query string that might do the job.