I replaced Chrome with an open source Android browser that runs every extension I need

Not every extension from the Chrome Web Store works properly. Some rely on desktop APIs that don't work well on phones. But ...

Google Chrome is working on new feature which lets you open PDF files in your preferred app

Chrome for Android is testing a feature that could automatically open downloaded files in the user's preferred app instead of ...
The Next Web

Chrome for Android is testing a feature that opens downloads in your preferred app instead of the browser

A Chrome Canary flag lets Android users open downloaded PDFs and files in their preferred app instead of Chrome's built-in viewer. No confirmed launch date.
Android Authority

Pairing Android with Windows File Explorer is the feature I didn't know I badly needed

Linking your Android phone to File Explorer does exactly what you’d expect: your smartphone files are listed within Windows File Explorer, seamlessly integrated alongside regular PC files, OneDrive, ...