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When trying to use UV sets above 4, I'm getting the following error(s):

Shader error in 'TestShader': invalid subscript 'texcoord5' at line 237 (on d3d11)
Shader warning in 'TestShader': Output value 'vert' is not completely initialized at line 169 (on d3d11)

Any ideas?

Update: when setting the UV directly on the Texture Sample node I get the error as mentioned above. When trying to set the UVs using the Texture Coordinates node I get a 'Standard Surface doesn't allow access to this channel' popup error. So there's clearly something going on - maybe UV5-8 are LWRP/HDRP only or something!

Hello, thank you for getting in touch and for your support!

At the time we added support for all 8 UV sets ( for Unity 2018.2 and above ), it was only available on vertex/frag ( templates ) and not on Surface Shaders, however, we've recently released an updated build in which Surface Shaders can now access all 8 UV sets.

Please ensure that you're on the latest version by downloading the current ASE build from our website, and let us know if this solves the issue.