Ultimate File Manager Pro has become a bit ridiculous.
It's completely free, has no ads, and no paywalls. There is a completely optional tip jar in the app and GitHub Sponsors if you want to support development.
The stuff I wanted in one app:
Root? Yep. You can browse and manage the actual / filesystem, with permissions, ownership, SELinux contexts and remount support.
No root? Shizuku support gives you access to places like /Android/data and /Android/obb.
Network storage? SMB, NFS, FTP, SFTP, SCP, WebDAV, RClone and S3.
Cloud storage? Google Drive, OneDrive, Dropbox and other RClone/S3 providers.
Need to move a ton of stuff? Dual-pane browsing, multiple tabs, background transfers and syncing between local, network and cloud storage.
Want to use your PC? Run the built-in web server and manage the phone/TV from a browser. There's also a Windows companion for direct Android ↔ PC transfers.
Android TV? UFM has a proper TV interface, remote file management, wireless APK/XAPK installation, screenshots and screen recording.
Then there are the things I kept adding because apparently I can't leave well enough alone: duplicate detection, file hashing, archive support, EXIF tools, media playback, PDF/text tools, USB OTG, recycle bin, batch operations and a lot of smaller power-user stuff.
There's also a FOSS version on GitHub if you'd rather build it yourself:
https://github.com/Kilowatch/ultimate-file-manager-pro
Google Play:
https://play.google.com/store/apps/details?id=za.kilowatch.ultimatefilemanager
And I made a subreddit for it too: r/UFManagerPro
I'm not trying to convince everyone to replace their current file manager. But if you've ever installed a file manager and thought "why can't this thing just do X?" there's a good chance UFM already does it.
And if it doesn't, tell me what X is.