Photo editing tools

Then you are using the mark-up extension. It will add a graphics overlay to the image, but not modify the photo beneath this overlay. The eraser tool can only erase the items in the added graphics, when you are drawing or writing onto the photo.

In what way does it not work?

There is no retouch tool or eraser in the photo editing tools on an iPhone (Edit photos and videos on iPhone - Apple Support), like we are having on a mac, or are you asking about Photos for Mac?

You're welcome. 😊

I wish Apple would add a retouch tool to Photos iOS, like on the Mac. It would make Photos much more versatile, if we could retouch minor blemishes, and the touch screen would come in handy.

We had these tools for a short time on the iPhone and iPad, a long ime ago, when Apple released iPhoto iOS - I purchased my first iPad just because of iPhoto iOS. Just with a touch of our fingers or the light pen I could retouch objects or dodge and burn certain areas. Apple has shown they can do it. But the upgrade to iOS 8 killed iPhoto on the iPhone and iPad, and since then I am mainly using it as a book reader or for viewing photos, bur no longer for editing photos.