can a registered user upload documents to a one category in the front end?
becouse I do not know how to do it. Problem whit the permissions for upload documents
Yes. It is possible. You just need to change a config settings. Go to EDocman-> Dashboard, click on the options button in the toolbar. Then select the Registered Group, set create permission to be allowed. After that, registered users should be able to upload documents from front-end.
Please try to do that and let me know if you need more help !