if (isset($_FILES["file"])) {
    // File to Upload
    $file = $_FILES['file'];
    // File Path
    $fileName = $file['name'];
    $filePath = $file['tmp_name'];
    try {
        // Create Dropbox File from Path
        $dropboxFile = new DropboxFile($filePath);
        // Upload the file to Dropbox
        $uploadedFile = $dropbox->upload($dropboxFile, "/" . $fileName, ['autorename' => true]);

             // File Uploaded
             echo $uploadedFile->getPathDisplay();
            } catch (DropboxClientException $e) {
                echo $e->getMessage();
            }
        }