This is the Isolated part of the mesh that has the problem , Exporting the other one works fine, but exporting this one and importing in Substance gives me that error , I tried rearrange the uvmaps , check for vertexes overlaps, look for holes but I can't find anything wrong ... can you help me analyzing this piece of…
Ok I actually managed to Delete the Island of mesh that had inside the problematic uv tiles, it happened to be 2 UV tiles having this problem although it showed only one problem in the Substance error message, I so selected one after the other the uv tiles and detached from the main model , exporting without those islands…