at this point, you will slowly pull down on the load assist buttons allowing the rounds to slowly fall into the magazine. I find it works best if you pull down, allowing 2 or
3 rounds to go in, then allow the spring back and allow the rounds correctly align/stagger.
do this until the tube is empty and repeat until the magazine is full and again until all of your magazines are full.
My load tube didn't line up like in your photo with the mag like your photos... Was also cut at a different length.
Still got it to work though with some work.