点击说明下面灰色的 Choose File, 选择所有要打印的发票(拖动鼠标或者按住Ctrl)。Select the PDF files you want to combine and upload them.
点击 Open 按钮完成选择,再点击合并&下载Click the big green button.
合并文件将出现在您的下载文件夹中。The combined file will be ready in download shortly after.