For me the issue of scanning has always been a tricky one, in the past so many smartphones didn't have this feature at all, but recently I got an iPhone and I didn't know how exactly to do it either, as the systems are very different with android phones. That's why I needed the help of experts and here
https://setapp.com/how-to/how-to-sca...iphone-or-ipad I managed to find information on scanning documents with an iPhone. It turned out to be quite simple and can be done in a second. So I recommend you to study everything here and try it, everything is described here step by step. Good luck.