How do you load a sample into OSC or Grain?

I was testing the OSC in Halion5 and just could not find anything in the manual about how to add samples to the OSC for sample or grain. Please show me the section that explains this.

Found the solution on Youtube. Drag and drop from a track with the sample in it onto a layer in Halion. I was assuming it would work to drag the sample onto the sample display in the sample tag in Halion.