I have a really simple question thats driving me crazy!!

I am trying to copy frames once I’ve drawn on them, by using the R key shortcut. but every time I try to draw on the new cell it does the same on all the other copied frames. I want to be able to copy a frame so that when I draw on the new frame it ONLY draws on THAT frame and not all the others too.

this is a simple question and I’m sure it has a simple answer but I’m getting really frustrated because i can’t animate anything!! please help me!!