Op-1 new samples

Hi I have a bunch of samples from my mellotron that I am trying to get into my op-1 and when I try to put them in the drum utility it only shows the 1 sample on the key that I put it on.
I have downloaded others from op-1.fun and when I put a melodic sound into the drum utility it immediately fills out the whole drum utility so that they are ready to use all across the op-1 so how do I get my samples to do the same thing?