Thanks, John! That worked beautifully and painlessly. 🙂
All I did was tack
<?php query_posts('category_name=News&showposts=5'); ?>
onto the top of my loop. 😀
Only problem with uploading outside of WordPress (e.g. via FTP) is that it won’t appear in your media library.
Workaround: upload a small file with the same filename via WordPress (that’s under post_max_size and upload_max_filesize), then access your server (e.g. via FTP) and swap out the real file for the small one.