I have a DJI wireless transmitter (the single one) which came with my OSMO Pocket 2. It works just fine with that.
However, I can't get it to pair with the new Action 3. The instructions I see online are related to the newer mic transmitters and receiving case.
Advice would be gratefully received.

Hi there. Thank you for reaching out. The DJI wireless transmitter for the DJI Pocket 2 is only compatible with the DJI Pocket 2 Do-It-All Handle. The said accessory is not compatible with the DJI Osmo Action 3. Thank you for your understanding and support.