I have watched several, but not all videos on sky replacement. They fell short when the sky was busy, with trees or other items. This is what I do
1) Create new layer
2) Use Gradient mask to select the Sky area
3) Use texture Filter and put in a new sky
4) Use a luminosity mask with the Texture Filter, This does seen to challenge Luminar Processing so be patient.
This prevents the trees and other darker items from being covered with new sky.
I use Windows 10 Stand-a-lone Luminar
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