How to integrate simogeo/Filemanager in CI 3?

Yes it is linked through a form editor but you can also call it stand alone, the documentation
is on their web site and it's just a matter of setting up the config file and the editor config
file.

Place the whole file manager folder in your assets folder and set it up from there.

I use it with CKeditor.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )