Dropbox library

i solved in part , it seem that cannot use Kunnu\Dropbox but only the path for example (i create a folder Dropbox and insert source inside)

the code that work is:

namespace App\Libraries\Dropbox;

instead of App\Libraries\Dropbox\Kunnu\Dropbox;

Its a big work because there are several folder out of this for example Guzzlehttp , Psr7 ecc

now the problem is that one class use a function instead a class , how can i import every function of this script ?