Can you double check what iPad you actually have and what firmware you're running (Settings - General - About)?
iPadOS 13 is required for USB external storage support. It does NOT work on 1st gen iPad Air/iPad mini 3 and older.
By the way, when I plugged in my genuine Apple USB3 Camera Connector adapter to the iPad, I got a message that the firmware on the adapter itself was updating.
I've used the adapter on iPad 6th gen, 7th gen and Pro and it worked fine on all of them (after plugging in to power).
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