Maybe you know this. Maybe at the time you read this it is already an obvious option on Substance Designer (as it should be). But worth sharing anyway since i did not find that tip around easily...
There's no "load custom mesh" for 3D view, but if you just drag an OBJ into 3D view you can preview your substance on your model. :) I usually do that to tweak custom materials on custom models so you can test the uv, and how it will look, how it stretches, etc.
To import the Object into your project so it will save along within the project file you should use this :
To import the Object into your project so it will save along within the project file you should use this :
