You figured it out in the time it took me to draft this but for future reference for anyone else…
How to make a poll
In a text field, click on the cog wheel
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Click Build Poll
   
Enter the parameters for your poll. Please note, each poll has different parameters
Click the Insert Poll button
   
The poll will now be set up in the text field.
   
Click Message to post the poll
   
Once you post a poll, you can only edit it for 5 minutes. Any votes cast during those 5 minutes will be erased.




