An essential feature in my view would be to have a new shortcode that allows each user - on the front-end - to upload files in those folders that he can access (private folders, edit own category = ON).
At the time being, with the plugin, I can only set a shortcode to let a user upload files into a specific category_id. Thus, if there are 100 users, and each of them is allowed to access to a single (different) folder/category, 100 different pages should be created by the administrator to let the user upload a file in his own folder. Each page should include a shortcode with the specific category_id.
A general shortcode - upload in one of the categories you are allowed to operate on - would definitively solve the problem.
Thank you in advance for your cooperation.