Hello, i need solution how add spare input group vertex to uvflatten aligned group?
detail(-1,"doors_a",0) not working for me and vertexgrouplist(-1) not working too.

thank you

Its difficult to say from a screenshot, but

- there is a warning on your uvflatten which may have more info
- you are promoting doors_a group just in spare input branch, so if after promotion it is vertex group, that'd mean that on main stream doors_a likely is not a vertex group therefore would not be found
- you can MMB on the Group 0 label to see if the expression correctly evaluates to expected vertex group list