Box content Uploader validation

Hi team,

I would like to validate File name and extension of each files before upload the bulk files into BOX

var uploader = new Box.ContentUploader();

//shows upload UI element
function showUploadContainer() {

uploader.show(folderId, ACCESS_TOKEN, {
container: '.container'
});
}

uploader.on('beforeupload', function (data) {
alert(data[0].name);

// This popup works. But There is no way to stop firing or excluding the file in the uploader widgets. After this message, If I click upload, it uploads the file without any issues
return false; (This is not working)

});

when I upload the below files, I want to get the error message like you cannot upload as the file name has special characters (%) and file type not accepted

aaa.pdf

aaa.html

aa%a.docx

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