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trello.addAttachment adds a URL attachment and can use it as the card cover. It doesn’t upload local file bytes.
automations/attach-trello-link.automation.ts
Provide card and a valid public url. Optional name sets the display label. setCover defaults to false. Second argument { account } defaults to the project binding. Returns Signal<TrelloAttachment> with id, name, url, createdAt, position, isUpload, and nullable bytes and mimeType. Keep id for deletion.