Recovering blown highlights

This is a quick example of using PShop's generative fill to recover blown/clipped highlights.

On the left is the original.

The results can, of course, be refined.
Just use the quick selection tool to select the area and expand it slightly then use generative fill without any prompts.

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My photos: www.gordonpritchard.blogspot.com/

never seen it in PS what menu is it in ?

It's in the beta version which you can download from Adobe if you have a subscription.

Here's a better example:

The original - note the shoes:

Here's the before and after:

In the current beta version of Ps, it's right next to content aware fill in the Edit menu.