Hands-on

Hi, I'm a newbie to adobe animate. I want to complete my assessment task by doing a Hands-on Tutorial "Fish Animation" but when I'm the tutorial start, I can't find "Aquarium_bg" and "Angelfish". I already search it but nothing. Can someone help me, why this happen and how to fix it. None of my friends happen to be in the same problem as me, it's just me. I ask my lecturer about it and he said maybe there was a third party app that conflic with adobe animate. How can I find the third party app and can anyone share the compatibility information. I'm a newbie, I really know nothing about this adobe animate.