I could not find any documentation of the process that leads to a message being displayed on the mobile app. For instance, we sent a message from Moodle with the following text component (the "fullmessage" property):

{{The activity http://example.com/1/ etc.
etc etc.
http://example.com/2/}}

The HTML part of the message seems to be ignored. When the mobile app displays the message, the last URL of this text is converted to a link, but the former URL isn't. What are the rules?

See the forum for a few unanswered questions and reversed engineered suppositions.