You can bake UDIMs with the texture set feature, it requires a little extra work but it's feasible. What you need to do: 1. For each UDIM, give the low poly faces a new material, ie: 1001, 1002, 1003, etc 2. Make sure to move all UDIM uvs to the 0-1 UV space 3. Enable texture sets There, now you'll be able to bake UDIMs…