Pictures not showing in the iPhone Notes [SOLVED]

I couldn’t find the cause and solution, but now I have, I’d like to share it with you.

In my Notes app on my iPhone 12, I had some notes which had pictures, but they weren’t showing. The pictures WERE visible on iCloud.com, when using a webbrowser to look at my notes.

Several Apple Advisors couldn’t fix it, but finally a Senior Advisor did. The trick was to un-sync the notes on my iPhone and re-sync them again:

Close your Notes app. Open “Settings”, at the top, click your name/picture, choose “iCloud”, choose “Show All”, click “Notes”, to remove all your (corrupted) iCloud notes from your iPhone, turn “Sync this iPhone” OFF. Turn “Sync this iPhone” ON again. Open your Notes app again and wait until all your notes are synced back to your iPhone.

The problem was probably caused by some hiccup at the moment I installed my iPhone 12 directly from my iPhone X. This method doesn’t use iCloud (backup).