[request] a guide on how to paint textures on landscape 3 or 4 layers in UE4.22

all the previous guides i have found on youtube are pre 4.22 and the TextureSample has changed from RGB R G B Alpha to RGB R G B A RGBA and I end up with a big black blob , fairly new with UE4 , if this is not aloud direct to the correct section, tell me where to post , or delete it ! TIA