File Attachment not working

Hi,

Is there a maximum or minimum number of files that can be attached for the message and how do configure this?

Is there a maximum files that we can control?

Is a copy of the message and any attached files kept anywhere on our wordpress instance installation? If so, what is the location http://contactform7.com/2014/02/26/contact-form-7-372/

https://ww.wp.xz.cn/plugins/contact-form-7/