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When in doubt, you can always drag and drop questions or case properties from the windows on the left of the form builder. But if you want to go for speed, here's how the hashtags work:
Let the Autocomplete Dropdown
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Help You Out
You don't have to know the exact format of the hashtag reference in order to use hashtags. Just enter # enter # and start typing to narrow down results. An autocomplete dropdown will appear that displays the best matches to what you've typed.
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