Checkout_files_upload empty file

Hello, I am using the “Checkout Files Upload for WooCommerce” plugin and it has been working well, but recently when I get the email notification I notice where the image is suppose to be an empty textedit file shows up with the name “checkout_files_upload”. Is this because the person did not upload a photo, so this is the default file, or is something else going on.

Email with empty file