Apps that work well with RSAF

• The Material Files file manager (GitHub|F-Droid|Play) lets you add RSAF remotes in the sidebar with Add storage → External storage
• DocumentsUI file manager aka com.android.documentsui aka Files lists SAF storage in the sidebar. This is actually the built-in Android file manager, you just need an "app" to add a shortcut, so you can start it from your phone's launcher. (Sadly, the similar "Files" app by Google does not make SAF storage easily accessible.)
  • Files (Play) is an app that creates this shortcut.
  • Documentsui-shortcut aka Files (GitHub) is another one, available as open source
• The Just Player video player (GitHub|F-Droid|Play) lets you open videos via SAF.
• The Symphony music player (GitHub|F-Droid|Play) can play from SAF storage, just add a media folder in Settings → Groove → Media folders
• The Musicolet Music Player (Play) can play from SAF storage, just add a media folder in Settings → Songs library and tags → Folder to scan → ADD FOLDER → Internal Storage

This is by no means a complete list, just some apps the authors of this Wiki page found useful.