I just did this step and I’m concerned I might have bent the little yellow cable or not seated it far enough into the connector. More will be revealed.
My suggestion might be to re-insert the cable before sticking the hard drive back onto the bracket. It might provide more flexibility and a better angle at getting the sleep LED cable back in the ZIF connector.
This is just for the sleep LED? and the IR sensor? right so if we don’t care about the LED for sleeping hard drive and never use the IR sensor then it doesn’t matter, right?