Cannot edit the alt tag or title tag of an image in the image gallery once it has been submitted

I want all alt tags to be initial caps but when I go into edit, there is no place to change "mirror" to "Mirror"

Please note - the Title field in this interface refers to the title that appears below the image, it is not an alt or title tag which should appear when a user mouses over the image or a screen reader scans the image.
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