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I'm trying to remove files with not allowed extensions on the FilesAdded event. (I can't use the filter parameter as I need an exclusive list). I have some code a bit like this: uploader.bind('FilesAdded', function(up, files) { var count = files.length; var i = 0; for (i;i<count;i++) { var validExt = validate(files[i].name); if(!validExt){ I need to remove the files added if the extensions aren't valid. I've tried the following: uploader.splice(i,1) uploader.removeFile(files[i]); uploader.refresh(); The FilesRemoved event is fired, but removed files still get uploaded with uploader.start(). I don't know if this is a bug in the program, or too obscure to expect an easy answer to, but if anyone can help, I'd be really grateful. I don't think I'm missing anything obvious. Thanks.