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Can't use track matte on my logo

PostPosted: Fri Mar 26, 2021 3:16 am
by Scotty Why
OK I must be missing something stupid.
I have a logo (png). I have a piece of video that I want to use as an animated matte to glitch out the logo.
This matte works fine when I use it on another piece of video but NOT when I try it on the logo. What am I missing?

Is it something to do with the PNG already having an alpha channel?

Do I need to do this in Fusion? I was trying to just use the color tab.