Boot animation help.

Hey everyone I'm having a weird problem for some I can't get my boot animation to change. I'm currently on chroma 6.0 and still showing lollipop animation. I am running att nexus 6 , I have try to use custom animations that I've likee and still only get the lollipop anime. Has anyone had this problem before Appreciate any advice given thank you!

Sent from my Nexus 6 using Tapatalk