Hi, I'm working my way through this game for the first time and for some reason, it won't let me place field cards. When I get to that section of the tutorial, and the field card is highlighted so that it's the only thing I can interact with, I try to drag it to the field (where the big circle is highlighted) but it keeps springing back to my hand. I've tried clicking, I've tried dragging, but it won't activate. And removing the field card from my deck doesn't help because then I can't win the battle. Am I missing some important step?