Is there any update on this? We would love to use Marmoset 4 for texturing in our production but not being able to use UDIMS is a huge hindrance ... which is a huge shame since i really love the overall design of the texturing tools of Marmoset 4!
UDIM support is not currently supported in Toolbag 4. This is something we plan to investigate, however, it's a large change both to the core rendering and texturing systems, so we do not have an ETA at this point.