SMS attachments

OS type and version Debian 11
Webmin version 2.102

I’m looking for details on how to configure SMS message sent by Webmin’s Service monitor. I have configured it, created an email and SMS template, and successfully received such messages.

The Scheduled Monitoring page provides buttons allowing users to specify the ‘Subject line for SMS messages’ in one of three ways: 1) None (alert is in the body), 2) Alert text (leave body empty), and 3) Custom text.

Option 1 results in:

(text from SMS template) [Attachment(s) removed]

Option 2 produces:

(text from SMS template) Date: Day, dd mmm yyyy hh:mm:ss -0400 (EDT) Message-Id: <nnn

Option 3 results in a message like this:

(custom text) (text from SMS template) [Attachment(s) removed]

Documentation found at System and Server Status - Webmin Documentation says nothing about configuring SMS. And I can’t find any documentation addressing the ability implied by the message itself to include an attachment. Are SMS attachments supported? If so, how would I go about specifying an attachment? Is there documentation on this feature anywhere?