Takayuki Miyoshi please help

Hey, I’m sorry to bother you, but really would love your help.

I love the plug-created, and I think it helps a lot of users.

I read a lot of materials and previous posts about a problem sending the files via your plugin.

I made sure I attached the file name appropriately and relevantely at the proper format in the right place. Also, making sure no conflicts with other plugins. However, I still can not get emails When I try to send attachments.

When I am not trying to send files, mail arrives perfectly.

https://wordpress.org/plugins/contact-form-7/