Some years ago I had an unexpected chance to take photos of some old family photos. The cousins that had these old ones had kept them in a cool, dry place since their mother passed away years before that.
No scanner available, cousins not willing to let me take the photos to a shop to be scanned.
The solution that worked very well:
There was a couch below a skylight in that house.
I put a chair in front of the couch, then got a tea-tray from the kitchen, and placed it on the couch so that when I was sitting on the chair, the line through the camera lens was 90 degrees to the centre of the tea tray. With tiny pieces of some blue "sticky stuff" (sorry, the name has escaped me), I fastened a picture to the tray, took a photo of it, and removed the picture to pass to my husband who already had the next photo ready to stick to the tray.
A few of the photos were curled and several pieces of the blue stuff helped to keep them flat on the tray.
The cousins were happy that they didn't have to let the precious old photos out of their sight; I was happy to have good copies of these old photos; my sister-in-law was the happiest of all when for her next birthday we presented her with one of the copies: a photo of the aunt she was named after, but of whom she had never seen a photo at all, and since the aunt lived in England had never met her either!

I used the same set-up again later, but outside in natural light on an overcast day. No skylight available, but photos of photos turned out just as well.