Auto Siphon Struggles

I purchased the Auto Siphon - 1/2" Racking Cane with a 3’ Auto-Siphon 1/2" hose. I’ve been testing this with water and my bottling bucket but can’t seem to get the flow consistently moving. Am I missing something? I would’ve thought this would be much easier than I’m making it. Any help would be appreciated!

you just pump it a few times and go, you need to have them setup so gravity does its job

Are you placing the bottling bucket at a lower level than the container you are siphoning from? What’s your actual process?

Skip to 1:30 in this video

https://www.youtube.com/watch?v=VIu6IRpFNr8