Can't get Chroma key to work

I’ve been trying to get a greenscreen video to work and I can’t seem to get it to work.

I’ve tried using Chroma key simple, advanced, changing distance, changing the key color to manually select it, auto select, pick a color, … Nothing works, it just keeps the video on top of the other one without removing the green part of it. How do I fix this?

You must be more specific. What version of Shotcut are you using? And also, describe your situation in a step by step fashion. If you can post pictures of your project in Shotcut that would also help too.

See this post:

in particular post 8 which says:

Everything composites with the bottom track, and when it is not working you do not have anything on the bottom track.

I was going to suggest the green screen to be on V2 and main video on V1