New function: copy attachments directly into the mail and automatically set the message title to the file name of the attachment

[AnN_34]

新建一个功能：能将附件直接复制进入邮件并将邮件标题自动设置为附件的文件名字

Create a new function: can copy attachments directly into the mail and automatically set the message title to the file name of the attachment

[Jon]

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