Mazda 2 DE How to fix the most common water leak in the trunk

I found way od water goes in my trunk. That place just on joint of back and roof of car, in my way from the left side. You see where i make a red circle on thmbnail photo. In video i trying to find a hole where water comes into my car. After a hour, i found that and i just put some silicone, black in my way cause my car is same color. I hope that video has help to you. Good luck. First try find leak from the highest point of the car and looking from inside where water comes. Best regrads to you!