PoE 2 - Cannons, Ready! Ascendancy Node

As a prelude, I would like to address my absolute adoration for this game. The ability to create and a unique build where the only limit is your imagination and the fact that I am unsure if this is the forum for this.

I have been working on trying to make Volcano-Shockwave Totem work as a build, which it was all going great, that is until I hit ascendancy. I had a plan, I don't know if it was a good plan but it was a plan regardless. I wanted to attempt using Totems to trigger the extra damage, and using spell totems to manage the up time of my Volcano.

I know what you're thinking, "How do you plan on using a projectile attack in that build to trigger 'Cannons, Ready!'?" Well I planned on using Molten Spray, it can gain bonus' from any Fire Damage synergies I plot into and is an "Attack/Projectile"

The problem you ask? It just does not work! The skill Gem meets the prerequisites, but does not trigger totem skills. Maybe I'm overlooking something due to my new to the game nature but I just feel like I ordered the McRib and got McGibbed LOL.

Can someone please let me know if I'm missing something here?

So youre trying to use spell totems to cast volcano if I understand you correctly?
I think the reason this isnt working might be because volcano is a channeled skill or because molten blast is used by a mace and doesnt apply to the "only use skills when you FIRE an attack projectile". not 100% sure though

If you want some advice, I would go for stormweaver if you want to play a volcano + shockwave totem build. You can get "Multiplying Squalls" for +2 to limit so you get 2 extra volcanoes which is helpful for clearing and very good for single target damage! I've seen a build like this work very well so its definitely possible to pull off.