Just watched the video, the majority of it Focuses on RC to app issue when it is probably a binding issue.
You almost got there but when you switched USB cables, it doesn't look like you pulled out the short cable from the side USB so you added to your problem where the mobile/app was no longer connected to the RC. Charging is not an indication of full connection. With the side port connected, that's all the bottom port will do.
Please create a video showing how you are re-binding. First stage is the RC showing 'BINDING' instead of 'CONNECTING'. Then push the bind button on the AC to that the led turns from green to red, then hopefully back to green.