These kinds of things never work, people rarely pick up non-obvious pronunciations or abbreviations (look at nginx, SQL, or npm). So don't get too attached to the idea.
Thanks for letting me know. The example shown is incorrect as you can't reply to it. Because to reply you need to have a channel id in event object and slack doesn't send a channel id for file_shared event (https://api.slack.com/events/file_shared).