u/Playful_Ad5151

Guys, im playing on aternos 26.1.1 java, paper software. I came across this farm https://youtu.be/Un-opjPr9LU?si=fvzyW7jRB-wDX4-l

And I have a problem with duping the tnt. Could any of the geniuses here help me know what I should do.