Thread:Project:Support desk/File import : Filename not automatically copied/reply

$wgCopyUploadsFromSpecialUpload should only add an interface to Special:Upload to enable uploading from URLs. If you ask me, I would say that the fact, that now nothing or the word "URL" appears in that field (especially also for cases, where no upload from URL is done at all), is a bug.

You should file that in bugzilla as a bugreport.