I'm sorry, but this concept shouldn't require a how-to page. It is good that you are putting one together, but your users should be able to figure it out intuitively.
Discussion
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Agree, we should update to drag-drop… I’ll check with nostr:npub137c5pd8gmhhe0njtsgwjgunc5xjr2vmzvglkgqs5sjeh972gqqxqjak37w to see if we can implement.