I have spent a lot of time reading and rereading the various threads on loading kml files into mapping apps. I just could not get anything to load into my iPhone 12. The issue was that after the files downloaded, I was not getting an option like "Open with", and if I pressed down on the files, they opened as text. One thing I had overlooked was changing browsers. I had been using Safari, and tried the downloading the Dutch Fraternity files with Chrome. I saw the small print option to download and later the open with. Success. That worked for Maps.me. I then tried downloading the files for Organic Maps. Not sure what would happened to Maps.me if I downloaded the files to Organic Maps (with something is working, I didn't want to screw it up), I downloaded the files to my computer and renamed them to include the name of the mapping app. The Dutch KML file has Maps.me in the name which gave me the idea. In this case I emailed them to myself. When I tried to download them, I found two things. The iPhone seemed to be sensitive to how I touched it. A light tap would open as a text, a heavy push would open a text and also a menu. Scrolling the menu I found the Share option (square with an arrow coming out of the top). Below the list of people I usually text to was a row of apps. Selecting the app would then download it. I think the confusion was caused by the different outcome from how I tapped, and at some point, probably around the time the iPhone 12 came out, Apple changed the wording. Share does not mean download to an app, but I guess it does to them. Hope this helps someone.