I want to do the same thing but you can't edit the post, you can only reply with your new videos. You'll have dozens of pages soon. You'd had to turn off commenting and be the only one posting.
You can modify posts within the thread. Maybe create a new thread and lock that and after you post the individual clip you can add it to your Main post with all your other videos. Because then each video can have its own thread with comments specific to that video still
