Best iOS app for scanning old photos

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My dh died over 5 years ago when our dc were in their teens.

I have decided to put a book together of photos of him at all stages of his life for dc.
I have more recent photos but need to find earlier photos to make the book complete.

I have emailed old friends and family who are kindly helping by looking through their old albums.

Which is the best app I can use on my phone to scan other people's photos? I have a Apple 13 pro if that makes any difference?

I'm happy to pay for a good app ( and I would prefer it to be easy to use!).

I plan to use blurb for the book itself and will transfer photos from my phone to my pc.

TIA.

Have a look at this youtube video and see if it helps. He rambles on a lot but he does show how to do it. Its PhotoScan by Google Photos and is free.

. Or look at one of the second hand shops for a flat bed scanner?

Hope this helps

Thank you very much - very helpful.