Additional Shader Channels on UI :|

So I just spent 2 hours racking my brain about why my UI shader wasn't receiving its 2nd uv channel. :(

Turns out Canvas' now have additional shader channels.
Can't find any documentation on this, or any mention of it.

I hope you guys plan on making this change clear.

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@CDF , what have you discovered so far on your own?

So now only UV0 is 'usable' in UIVertex?

As far as I'm aware, yes. You have to explicitly set the extra shader channels on the Canvas.

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