Thought problem solved when seeing the article mentioned setting default app to open diff file type in File app, but disappointed!
The Preview app is the best of all new features found in Ios26. However, it replaces the default action of “clicking to open” in File app. While Preview app is of better features set, it does not support swiping to view the next file. The user has to close it and click to open the next file, which is too clumsy thus browsing through doc/pic files in File app no longer possible.
One work around is to long click a file and select “quick view”. But that is only one time setting (Apple should add an option in File app settting!)
The said hidden settings of default app to open certain file type is too “hidden” (in file info), and the worst of all, the “quick view” of File app is not one of the option here!