You will find that subtasks rarely display estimates, and the reason for that is that subtasks are designed to be checklists rather than work orders as Stories/Tasks are. It is not how many uses them, but that is the reason you don't see them in the scrum board or in the stories themselves.
In your example, I would have suggested that your story is too high up and each of the tree subtasks are actually the work orders and the story just work as a container, which is what epics are for.
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