Good evening everyone. For the last 6 weeks i have been testing out ALL (and i mean it) all open source ecommerce packages and at the end i stood with Arastta.
So far i love it.

My problem is: i can create folders within the filemanager, but cannot upload files to it.
I remembered that i had a similiar problem with OpenCart and here is what i found out.

My Host does not allow the PHP Glob_Brace module. I am not an expert, but by what i have found out, it's used to show files of certain types within a folder.
There are several workaround for this, like creating your own functions or simply by removing the GLOB_BRACE attribute within the files.
The latter is not perfect as with every update these lines would be overwritten.

FIRST - FIND YOUR PROBLEM!
Thanks to the good documentation of Arastta i found out that you can activate an ERROR LOG system via the system settings.
You should do so!
My log should me this error:

017-05-04 22:55:45 - PHP Notice: Use of undefined constant GLOB_BRACE - assumed 'GLOB_BRACE' in /mnt/web204/arastta/admin/controller/common/filemanager.php on line 45
2017-05-04 22:55:45 - PHP Warning: glob() expects parameter 2 to be integer, string given in /mnt/web204/2017-arastta/admin/controller/common/filemanager.php on line 45

There are several solutions for this that i remembered from OpenCart boards:
https://forum.opencart.com/viewtopic.php?t=165375
https://forum.opencart.com/viewtopic.php?t=145874

At the end i used the followin Github commit to make OpenCart working on my Host's server:
https://github.com/xming/opencart/commit/cdeed6ef3f1065ef6ba36630554a9568bb3af59d

After another 60 minutes i deleted OpenCart

So far i am realy happy with Arastta, though i have only played around with Theme customization.
Thanks a lot guys!