Fine Uploader overwrite a file

Question

Hello i'm beginner with fine uploader, i have setup my upload form and my endpoints uploader file and handler uploader file. Now i'am trying to importing the same file 2 time but i can't overwrite a existing file, how to do this?

here my fine uploader config in my uploader page

 var restrictedUploader = new qq.FineUploader({
            debug: true,
            element: document.getElementById("fine-uploader-validation"),
            template: 'qq-template-validation',
            request: {
                endpoint: "report-upload.php"
            },
            deleteFile: {
                enabled: true,
                endpoint: "report-upload.php"
            },
            chunking: {
                enabled: true,
                concurrent: {
                    enabled: true
                },
                success: {
                    endpoint: "report-upload.php?done"
                }
            },
            resume: {
                enabled: true
            },
            retry: {
                enableAuto: true,
                showButton: true
            },
            thumbnails: {
                placeholders: {
                    waitingPath: '/placeholders/waiting-generic.png',
                    notAvailablePath: '/placeholders/not_available-generic.png'
                }
            },
            validation: {
                allowedExtensions: ['pdf'],
                itemLimit: 100,
                sizeLimit: 1151200 // 50 kB = 50 * 1024 bytes
            }
        });