I'm trying to fix this jump animation because as you can see from the sprite sheet, the last sprite is not in the jump animation for some reason. Previously I was able to just drag and drop sprites in the order and at the time i want them to play. Now though I am unable to drag that sprite onto this animation. I can click the animation and add key frame, but it automatically adds the first sprite from the sprite sheet (I don't even know how it knows to grab that one and not any number of the other sprites?) Why am I unable to add this and how can I fix this problem?

Finally figured this out. You have to select the gameobject in the hierarchy. That's super annoying.... lol.