Help! I'm getting a lot of color banding Within photos

Yeah, it's noticeable in blue sky photos in either HEIF or jpeg without any editing. It also occurs in gray skies, but isn't as noticeable until you edit. The only way around it at this point is to shoot in raw and if space is an issue, do minor edits in Photos, then open it in an app like Photoshop Express as a jpeg and then save it. The delete the raw if you want. Apple needs to fix this. I also wish they'd give the option of shooting HEIF or jpeg with a flat profile. That might help too.

I've figured out what it is. It's the Scene Detection which defaults to on. Go into the Settings and in Camera turn it off. And, I've also turned off "View Full HDR" in Photos Settings. That adjusts the display to show the full dynamic range and shouldn't affect edits, but I think it does.

The Scene Detection is similar to the Intelligent Auto setting on many cameras and so it detects a blue sky scene, but overcooks the sky. I'm getting much better results now for editing with it off. Bear in mind that Apple ProRaw includes adjustments that Scene Detection does. It's raw, so it shouldn't matter, but see if it helps.

just a random photo taken that has that issue too.