Sending messages with attachments

Hi everyone!
Could you please tell me if there’s a possibility to send messages from physicians (OpenEMR v5.02) to patients (native Patient Portal) and backward with attached files? Is it possible to do that without installing any external applications? Can I attach .xlsx files (Microsoft Excel) somehow?
Another problem is that now I can mail from the patient to the physician with Secure Mail, but I can’t mail from the physician to the patient.
Would you be so kind to help with these problems?
Thank you in advance!