ES File Explorer File Manager 4.2.0.3.5
Refer: https://www.apkmirror.com/apk/es-global/es-file-explorer/es-file-explorer-4-2-0-3-5-release/
4.2.0.3.5-851.apkmirror.com.apk
It now has locked basic features behind $10/month premium price
Technical notes, and other ideas.