I have an iPad Pro with Lightning connector and a Keystep Pro, which I use with the (oddly-named) ‘Lightning to USB 3 Camera Adapter’. This allows the lightning charger to be plugged in at the same time. The nearest equivalent for you looks like the ‘USB-C Digital AV Multiport Adapter’. You may get away with the Apple ‘USB-C to USB Connector’, but you won’t be able to connect to power at the same time. You will also need a standard USB A-B cable, of course.
Thanks for your reply.
The “usb-c digital AV multiport adapter” you mentioned - this is just an assumption right? Based on you working with a different ipad(different charging connector)