tamte

pan
I'm not getting an error.
but when i'm select v4 attribute wrangle i can't see UV4 channel but v3 wrangle is OK.

then it sounds like you already have v@uv4 attribute on the input geo instead of p@uv4
just running p@uv4 = something on next wrangle would not cast uv4 from float3 fo float4, so make sure your input attribute is correct type
but if you don't see it at all, then maybe something else is going on, post a file

EDIT: aaah, you don't see it in that list, not in geometry spreadsheet
for those you need to set attribute type info to texturecoords
even though it still doesn't seem to show up, so maybe submit rfe, just know that your float4 attribute exists and you can use it to do whatever you want with it
but it will at least show up in texture related sops like uvtransform if you set the type info

what does it mean not working, do you get any error?

it works for me correctly