 So, you're not sure how to get your UDIMs from Blender to Substance. Not a problem. If you have UDIMs set up from Blender, and you want them to show up and painted, just do your standard file, new, and import procedure. But this time make sure you check Use UV Tile Workflow. The default is usually the one you want, and from here click OK. You're done. Your UDIMs should now show up on the grid in your UV area. Now, usually it will apply whatever size you set to the entire grid. If you ever want to change the global size of everything, you can go under Texture Settings and change it here. But if you want each grid to be a different size, for example, if we want this one to be at 4K, and this one to be at 1K, when you click on Tile, you can easily change it over here. And afterwards, you can see that the new resolution will be displayed in the corner of each grid. So, hope that helps, and as always, a beautiful fantastic day, and I'll see you around.