DJI support and docs say that this connector is for stowing the Lighning connector for storage, but it has a tab (looks like a typical male connector) inside that blocks the Lightning male connector. Makes no sense to me.
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I was a moron for not looking more closely at empty "connector" but I got the location by merely referring to the only illustration DJI provides.
It's quite small in print, and both ends of the white smartphone cable seem to be visible, giving the reader the impression that the USB-C end plugs in as shown (on the left, when the controller is upside down). DJI could make this less ambiguous. Also, their support agents should know about this possible DOH! because before posting here I submitted the same picture and question in a chat with DJI support. Despite several minutes of appearing to research the question, the agent did not discover the connection mistake. Congrats to the very observant @PhiliusFoggg!
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