I have files uploaded to Dropbox in different folders (which act as Categories). What I like is to use API to list all files from specified folders and be available to filter per Category(ies) on webpage in responsive format, php is the must. Sorting also should be available on all columns. Each file should have ability to be downloaded right from this page. Additional features which might be nice to have but not very critical I will discuss later. Files mostly pdf, sometimes pics and/or word docs.
I will pay reasonable amount for project, of course.