Hi @David B Parle! Because creating collapsible sections using Markdown is a workaround and not a Card editor feature, there are going to be some limitations to this path. Guru’s Card editor uses the Commonmark flavor of Markdown and either their tutorial/walkthrough or the reference guide are recommended resources.
I’ve also converted the question into a Product Feedback post so that our product team can track interest in the form of upvotes and comments! Whenever you have a moment, it would also be helpful for the team working on our Card editor to hear a little more of the context around your team’s use case for collapsible sections. Thank you!
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