Reorder drum pads ipad

I’m trying to reorder drum pads in Dorico for iPad. I select the move button, but I can’t seem to find a way to select a pad and move it. Touching anywhere on a pad doesn’t seem to select it. Tried long press, not working. I know I’m missing something obvious, but I can’t figure it out.

Yes, it looks like something’s not working correctly here: I find that I can rearrange the pads by dragging them with the Apple Pencil, but not with my finger. I’ll need to follow up on this with a colleague to see what might be going on there. Please bear with me.