When you press CTRL + T it opens the file explorer when you select the textures in this case UDIMS textures. It hooks up the nodes, but the textures are not recognized as UDIMs so you have to manually go to each image and select UDIMs as well as go to the image editor for each one add the proper amount of UDIM boxes and hit refresh on each image (after that it displays correctly). I believe it should auto detect UDIMs and do that all automatically..