Free up space when files are no longer "kept offline"
When you mark files as "keep offline" in the official Android app, it'll download the file to your device. But when you unmark "keep offline", the storage space is not freed up. Only way to free it up is to delete all app data in Android's settings, or uninstall/reinstall the app.
Sun Sham commented
I need this please... my phone always full and i saw onedrive eat up too much space.