My iPad Air 3gen will not respond to apple sd reader however iPhone 11 can what am I doing wrong?

See >>> Import photos using Apple camera adapters - Apple Support

Ensure that your iPad has been updated to the most recent version of iPadOS (currently iPadOS 14.7.1).

same problem on my ipad air 2 ios14.6 and my iphone 11 pro ios 14.7.1. Tried to restart device and open close cam with same result. Think it is a ios bug

I get a message device not recognized