Typically, a user selects a file using a file upload form control, submits the form and waits, sometimes for quite a long time, for some sort of confirmation screen.

• 通常情况下，一个用户选择一个文件用一个文件上传表单控制，提交形式和等待，有时今后相当长一个时期，某种形式的确认屏幕。