If you click on the hamburger menu you will have the choice of New folder, Library setting, and new document library.

This button creates a new folder. The window or folder you are in when you click the new folder button is the place that the new folder will appear.

By choosing the library settings button you will be directed to the setting.

See chapter 18.3 for access control on the root folder.

Here you can choose between two different types of document library.

Within the document

To upload a new revision of a document click the new revision button. This will open the file explorer and there you can choose the file you want to upload.

Here you can delete folder(s) or document. When you press the delete button you will get a window that asks you if you are sure.