@eagletree Hey thank you mate for this tutorial! Now all goes well, I can’t describe how thankful I am. But this tutorial is missing one important step (it’s for people who will search solutions): DON’T FORGET to set your Physical Materials in Materials itself!
Find folder with materials (mine is StarterContent/Materials) > Go to “M_Ground_Grass” for example > “Details” window on the left-bottom > Physical Material > Phys Material > Choose “PM_Grass” > APPLY AND SAVE. Repeat this step for the other materials.