Fossify File Manager is a free, open-source alternative to Google Files with a privacy-first approach ...
The default Android file manager is a serviceable app. It does what you need and not much more. Plus, like all built-in Android apps, it plays well with the operating system and has a consistent look ...
File Explorer does have a Preview pane, but it eats into the main window permanently, and it still only offers a very tiny preview. It could be much better.
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