Hub for iPad with two USB C ports, one for charging iPad and one for passing audio to mixer

I want to be able to charge my iPad Pro, which has a USB C port, whilst connecting it to an Allen & Heath ZEDi-10 mixer. I bought a UGREEN hub for this purpose: https://www.amazon.co.uk/dp/B0D1XLNWP2?ref=ppx_yo2ov_dt_b_fed_asin_title

When I connect the mixer to one of the 10Gbps USB C ports, I am able to get audio into the iPad through one of the channels on the mixer, but no audio is passed back to the mixer for monitoring. When I use the same USB C cable to connect the iPad directly to the mixer (without using the hub), everything works OK. So I am assuming that there is some issue with the hub, and wondering whether a different hub would work?

Would be grateful for any advice.

Thanks,

Nick