Strategy to clean upload files is required
Upload files still exist even when we delete all posts using it, and wasting disk space if there's too many files.I think a command line API should be given at least.
i agree too, the files exists too much, and many files are not used any more.
There is a report that shows abandoned files. You can delete them manually. A bit of a pain, but there is little other way to be sure that something isn't needed.