To add your own videos, you need to use the Picture symbol (confusing, isn't it!)
But I think the size limit is 100MB.
It's easier to create a YouTube channel and upload them there, then share the link here.
Unfortunately that link appears to be to your OneDrive account which I can't view ☹️
Commented on https://youtu.be/boCzBRorhvYI'd reall...
01 Jul 04:35
Most obvious thing I can see is that you're in a poo-man stance, bending from the hips, because your back knee is pointing out to the side instead of to where you're going.
If I were you, I'd look at the surf skating drills and practice compressing and extending over the front foot with your head up and back straight.
Once you've got the posture right, the rest should be much easier.
Oh, and the lifeguards need to have a serious word with the idiot who paddled over the shoulder right in front of you!