Can't send attachments

I have a problem. I have cformsII installed on my site and I can’t get it to send attachments to my email. I do receive emails if the form has other fields, but if I try to send an attachment it doesn’t work. It also doesn’t save the files to my folder. The absolute path to the folder is correct (I checked with my hosting) and all the folders have the permission 775.

This is a page of my site with a form that has an attachment field: http://www.techsell.fr/jobstechsell/nos-annonces/chef-projet-junior/

https://wordpress.org/plugins/cforms2/