How do I change the default app in files app for different file types? - SOLUTION
Since I wasn't able to post the answer into an old thread, I created a new one.
It took me a while to figure that out.
In the files app you can use the share button and chose the standard app you like for that file type.
From now on everytime you open that same file type, it will be opened in that app you chose.
iPad (6th gen) WiFi