If you try to use the "/gator" slash command to reply to a message in a Slack thread, Slackbot will show you a message like this:
Slack doesn't support slash commands in threads, but you can still send a Gator message in a thread by using a Slack message shortcut.
First, open up the Slack message shortcut menu. On your computer, you can do that by hovering over the Slack message you would like to reply to and clicking the "..." menu. On your mobile device, you'll need to tap the message you'd like to reply to and then tap the "..." menu. You could also press and hold on the original Slack message to open that same menu directly.
Then, scroll down until you see the "Schedule a reply" message shortcut. If you don't see it in the list, click "More message shortcuts..." and search for Gator to find the "Schedule a reply" shortcut.
After that, Gator will prompt you to enter your message and confirm when it should be delivered.
And then you're done! Gator will store and deliver your new message just like any other Gator message you send, except that it will appear as a new reply in that Slack thread instead of as a brand new message in a Slack channel.
NOTE: Due to a Slack bug, it is not currently possible to send your reply as a new message to the thread's Slack channel in addition to including it as a reply in the thread. Once Slack fixes that bug, we'll turn on that ability for your Gator messages as well.