peeling pint

Hello, I’m going to be painting my bathroom ceiling which was never primed (new build) and after 5 years has started to peel so can’t really argue with it. I’ve removed all of the peeling / flaking and sanded down the edges but need a little help on the ordering of the next steps, this is my...

We had painted our walls with valspar sheen paint and looking to re paint. There are a couple of areas that if you want can pick at the paint edge and peel chunks off. There are areas about 12icnhs where this has happened. However if we sand back the edge it still showing through the paint...