I can see the video on my Windows PC. Sometimes it just takes a while to fully upload to R2R.
Sadly, I cannot help because I am completely inept at *real* aquascaping. I have for years been nothing more than a *rock stacker*.
Recently, I tried my hand at a more contemporary rock scape. I tried ordering the very expensive Marco shelf rock and foundation rocks, and it looks like you may have some of the same stuff. In the end I did not like the shelf rock at all. They are not nearly as flat as I expected, and I wouldn't recommend them. The foundation rocks were wicked expensive, but they "worked" well, I thought. In the end I didn't use them either because I found that I could glue *regular* rock and have it be plenty stable and also allow for more water flow under the rocks.
While many use epoxy and even mortar, for my small, humble rock scape I used regular, non-gel super glue from my local dollar store and baking soda. The baking soda acts as something of an insta-set for the super glue. I did this for a very shallow tank, less than 12" tall, but I felt like the super glue and baking soda set up firmly enough that I didn't bother with any epoxy or anything other than an occasional spot of Gorilla Glue Super Glue gel.
Here's my journey in aquascaping, for all to have a good laugh :)
https://www.reef2reef.com/threads/please-critique-my-‘scape-and-what-is-marco-rocks.1099121/
Good luck!