SendEmail Step: add option to include the content of file on the server in the email body

to make the SendEmail more robust, would be nice if we can include an option to copy the content of a file on the server ( or step resource ) into the email body. That way the customers can write anything they want in a previous step and save it on the server, and then send it instead of an attachment just as the email body. it would be their responsibility to make sure the content of the file does not exceed the field length limitation.