This (Simple Mobile Tools) used to be a good set of apps. But it got bought up a an ad firm. The new, still ad free apps, are known as Fossify: https://play.google.com/store/apps/dev?id=729783837865432255...
These applications are blessedly feature complete, and I haven't noticed any issues being "stuck" on the F-Droid versions.
[1] https://github.com/SimpleMobileTools/Simple-File-Manager
[2] https://f-droid.org/en/packages/com.simplemobiletools.filema...
Forgot about that!