Hi Michael, I see now, using 'Pony Mail', that there is no attached file in my message. Probably not possible - I didn't know it, I'm sorry. I have used an email client to attach the file and reply and I can also see it and open it in our correspondence - in both of my email clients, desktop and phone.
Nevertheless, I would like to contribute and I'm gonna take the necessary steps to register myself as a contributor. Regards, Daniel