CKEditor Image Browse - Root back directory

[justanumber]

Most likely out of ordinary use, but need to have root image path like:
../mathtest/data/img

Cannot seem to get working.
Have tried:

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protected $root = '../mathtest/data/img';

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protected $root = '/../mathtest/data/img';

and

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protected $root = '../mathtest';
protected $imgdr = '/data/img';

In past, have always used the fast and easy way:

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'filebrowserImageBrowseUrl': '/path_to/ckeditor/plugins/imgbrowse/imgbrowse.html?imgroot=img',

But that will not work with "?imgroot=../mathtest/data/img" either

Is there a way to use "../mathtest/data/img" with the plugin?

Many thanks in advance for your assistance.

My bad. Seems I was not going up extra directory.
Solved by adding extra "../"

Cheers!