I don\'t see an option in the plupload API docs on restricting the number of files uploaded, to any number, even 1.
Doc fail? or Feature fail? If it doesn\'t exist I\'ll
Based on Jonathon Bolster's second answer, I wrote this simpler snippet to restrict upload to the last selected file:
uploader.bind('FilesAdded', function(up, files) { while (up.files.length > 1) { up.removeFile(up.files[0]); } });