SAP MII 15.0 Send e-mail with attachment

Hello

in the past I used MII 12.2 SendMail action

I used it with:

- AttachmentContent (a generic string, like "My attachment text")

- AttachmetFile (a generica file name, like "A.TXT")

and the result was an e-mail with an attachment called A.TXT and inside the string "My attachment text"

Now with MII 15.0 I get an error

[ERROR] [Send_Mail_0]Unable to send mail Exception: [Access to the attachment /A.txt is not allowed]

Do you see anything wrong in my way to use the attachment?

Thanks

Regards